/*
 * Plugin Name: APCu Object Cache
 * Description: APCu backend for the WP Object Cache.
 * Based on Plugin named APCu Object Cache Backend
 * Plugin URI: https://wordpress.org/plugins/apcu/
 * Author: Pierre Schmitz
 * Author URI: https://pierre-schmitz.com/
 * Plugin URI: https://wordpress.org/plugins/apcu/
 *
 *
 * @Authors James Dugger, Jonathan Bardo
 * @copyright 2017 GoDaddy Inc. 14455 N. Hayden Road Scottsdale, Arizona
 */

$oc_logged_in = false;

foreach ( $_COOKIE as $k => $v ) {

	if ( preg_match( '/^comment_author|wordpress_logged_in_[a-f0-9]+|woocommerce_items_in_cart|PHPSESSID_|edd_wp_session|edd_items_in_cartcc_cart_key|ccm_token/', $k ) ) {

		$oc_logged_in = true;

		break;

	}

}

$oc_blocked_page = ( defined( 'WP_ADMIN' ) || defined( 'DOING_AJAX' ) || defined( 'XMLRPC_REQUEST' ) || 'wp-login.php' === basename( $_SERVER['SCRIPT_FILENAME'] ) );

function wpaas_is_using_apcu() {

	return version_compare( PHP_VERSION, '5.6.0', '>=' ) && function_exists( 'apcu_fetch' );

}


if ( 'cli' !== php_sapi_name() && ! $oc_logged_in && ! $oc_blocked_page && wpaas_is_using_apcu() ) :

	/**
	 * Save the transients to the DB.  The explanation is a bit too long
	 * for code.  The tl;dr of it is that we don't have a single 'fast cache'
	 * source yet (like memcached) and so some long lived items like transients
	 * are still best cached in the db and then brought back into APC
	 *
	 * @param string  $transient
	 * @param mixed   $value
	 * @param int     $expire
	 * @param boolean $site = false
	 *
	 * @return bool
	 */
	function wpaas_save_transient( $transient, $value, $expire, $site = false ) {
		global $wp_object_cache, $wpdb;

		// The 'special' transient option names
		$transient_timeout = ( $site ? '_site' : '' ) . '_transient_timeout_' . $transient;
		$transient         = ( $site ? '_site' : '' ) . '_transient_' . $transient;

		// Cap expiration at 24 hours to avoid littering the DB
		if ( $expire == 0 ) {
			$expire = 24 * 60 * 60;
		}

		// Save to object cache
		$wp_object_cache->set( $transient, $value, 'options', $expire );
		$wp_object_cache->set( $transient_timeout, time() + $expire, 'options', $expire );

		// Update alloptions
		$alloptions                       = $wp_object_cache->get( 'alloptions', 'options' );
		$alloptions[ $transient ]         = $value;
		$alloptions[ $transient_timeout ] = time() + $expire;
		$wp_object_cache->set( 'alloptions', $alloptions, 'options' );

		// Use the normal update option logic
		if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
			$flag = $wpdb->suppress_errors;
			$wpdb->suppress_errors( true );
			if ( $site && is_multisite() ) {
				$wpdb->query(
					$wpdb->prepare(
						"INSERT INTO `{$wpdb->sitemeta}` ( `option_name`, `option_value`, `autoload` ) VALUES ( %s, UNIX_TIMESTAMP( NOW() ) + %d, 'yes' ) ON DUPLICATE KEY UPDATE `option_name` = VALUES ( `option_name` ), `option_value` = VALUES ( `option_value` ), `autoload` = VALUES ( `autoload` );",
						$transient_timeout,
						$expire
					)
				);
				$wpdb->query(
					$wpdb->prepare(
						"INSERT INTO `{$wpdb->sitemeta}` ( `option_name`, `option_value`, `autoload` ) VALUES ( %s, %s, 'no' ) ON DUPLICATE KEY UPDATE `option_name` = VALUES ( `option_name` ), `option_value` = VALUES ( `option_value` ), `autoload` = VALUES ( `autoload` );",
						$transient,
						maybe_serialize( $value )
					)
				);
			} else {
				$wpdb->query(
					$wpdb->prepare(
						"INSERT INTO `{$wpdb->options}` (`option_name`, `option_value`, `autoload`) VALUES ( %s, UNIX_TIMESTAMP( NOW() ) + %d, 'yes' ) ON DUPLICATE KEY UPDATE `option_name` = VALUES ( `option_name` ), `option_value` = VALUES ( `option_value` ), `autoload` = VALUES ( `autoload` );",
						$transient_timeout,
						$expire
					)
				);
				$wpdb->query(
					$wpdb->prepare(
						"INSERT INTO `{$wpdb->options}` (`option_name`, `option_value`, `autoload`) VALUES ( %s, %s, 'no' ) ON DUPLICATE KEY UPDATE `option_name` = VALUES ( `option_name` ), `option_value` = VALUES ( `option_value` ), `autoload` = VALUES ( `autoload` );",
						$transient,
						maybe_serialize( $value )
					)
				);
			}
			$wpdb->suppress_errors( $flag );
		}

		return true;
	}

	function wpaas_prune_transients() {
		global $wpdb;

		if ( ! empty( $wpdb ) && $wpdb instanceof wpdb && function_exists( 'is_main_site' ) && function_exists( 'is_main_network' ) ) {

			$flag = $wpdb->suppress_errors;
			$wpdb->suppress_errors( true );

			// Lifted straight from schema.php

			// Deletes all expired transients.
			// The multi-table delete syntax is used to delete the transient record from table a,
			// and the corresponding transient_timeout record from table b.
			$time = time();
			$wpdb->query( "DELETE a, b FROM $wpdb->options a, $wpdb->options b WHERE
		a.option_name LIKE '\_transient\_%' AND
		a.option_name NOT LIKE '\_transient\_timeout\_%' AND
		b.option_name = CONCAT( '_transient_timeout_', SUBSTRING( a.option_name, 12 ) )
		AND b.option_value < $time" );

			if ( is_main_site() && is_main_network() ) {
				$wpdb->query( "DELETE a, b FROM $wpdb->options a, $wpdb->options b WHERE
		a.option_name LIKE '\_site\_transient\_%' AND
		a.option_name NOT LIKE '\_site\_transient\_timeout\_%' AND
		b.option_name = CONCAT( '_site_transient_timeout_', SUBSTRING( a.option_name, 17 ) )
		AND b.option_value < $time" );
			}


			$wpdb->suppress_errors( $flag );
		}
	}

	/**
	 * If another cache was flushed or updated, sync across all servers / processes using
	 * the database as the authority.  This uses the database as the authority for timestamps
	 * as well to avoid drift between servers.
	 * @return void
	 */
	function wpaas_init_sync_cache() {

		global $wpdb;

		if ( empty( $wpdb ) || ! ( $wpdb instanceof wpdb ) ) {

			return;

		}

		$flag = $wpdb->suppress_errors;
		$wpdb->suppress_errors( true );
		$result = $wpdb->get_results(
			"SELECT option_name, option_value FROM `{$wpdb->options}` WHERE option_name = 'gd_system_last_cache_flush' UNION SELECT 'current_time', UNIX_TIMESTAMP( NOW() ) AS option_value;",
			ARRAY_A
		);
		$wpdb->suppress_errors( $flag );

		if ( empty( $result ) ) {

			return;

		}

		$master_flush = false;

		foreach ( $result as $row ) {

			switch ( $row['option_name'] ) {

				case 'current_time' :
					$current_time = $row['option_value'];
					break;

				case 'gd_system_last_cache_flush' :
					$master_flush = $row['option_value'];
					break;

			}

		}

		$local_flush = wp_cache_get( 'gd_system_last_cache_flush' );

		if ( false === $local_flush || $local_flush < $master_flush ) {

			wp_cache_flush( true );

			wp_cache_set( 'gd_system_last_cache_flush', $current_time );

		}

	}

	/**
	 * Start default implementation of object cache
	 */

	if ( ! defined( 'WP_APC_KEY_SALT' ) ) {

		define( 'WP_APC_KEY_SALT', '' );

	}

	function wp_cache_add( $key, $data, $group = '', $expire = 0 ) {
		global $wp_object_cache;

		if ( 'transient' == $group ) {
			wpaas_save_transient( $key, $data, $expire );

			return $wp_object_cache->add( "_transient_$key", $data, 'options', $expire );
		} elseif ( 'site-transient' == $group ) {
			wpaas_save_transient( $key, $data, $expire, true );

			return $wp_object_cache->add( "_site_transient_$key", $data, 'site-options', $expire );
		} else {
			return $wp_object_cache->add( $key, $data, $group, $expire );
		}
	}

	function wp_cache_incr( $key, $n = 1, $group = '' ) {
		global $wp_object_cache;

		return $wp_object_cache->incr2( $key, $n, $group );
	}

	function wp_cache_decr( $key, $n = 1, $group = '' ) {
		global $wp_object_cache;

		return $wp_object_cache->decr( $key, $n, $group );
	}

	function wp_cache_close() {
		return true;
	}

	function wp_cache_delete( $key, $group = '' ) {
		global $wp_object_cache, $wpdb;

		if ( 'transient' == $group ) {
			if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
				$flag = $wpdb->suppress_errors;
				$wpdb->suppress_errors( true );
				$wpdb->query(
					$wpdb->prepare(
						"DELETE FROM `{$wpdb->prefix}options` WHERE option_name IN ( %s, %s );",
						"_transient_{$key}",
						"_transient_timeout_{$key}"
					)
				);
				$wpdb->suppress_errors( $flag );
			}

			$wp_object_cache->delete( "_transient_timeout_$key", 'options' );

			// Update alloptions
			$alloptions = $wp_object_cache->get( 'alloptions', 'options' );
			unset( $alloptions["_transient_$key"] );
			unset( $alloptions["_transient_timeout_$key"] );
			$wp_object_cache->set( 'alloptions', $alloptions, 'options' );

			return $wp_object_cache->delete( "_transient_$key", 'options' );
		} elseif ( 'site-transient' == $group ) {
			if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
				$table = $wpdb->options;
				if ( is_multisite() ) {
					$table = $wpdb->sitemeta;
				}
				$flag = $wpdb->suppress_errors;
				$wpdb->suppress_errors( true );
				$wpdb->query(
					$wpdb->prepare(
						"DELETE FROM `{$table}` WHERE option_name IN ( %s, %s );",
						"_transient_{$key}",
						"_transient_timeout_{$key}"
					)
				);
				$wpdb->suppress_errors( $flag );
			}
			$wp_object_cache->delete( "_transient_timeout_$key", 'site-options' );

			// Update alloptions
			$alloptions = $wp_object_cache->get( 'alloptions', 'options' );
			unset( $alloptions["_site_transient_$key"] );
			unset( $alloptions["_site_transient_timeout_$key"] );
			$wp_object_cache->set( 'alloptions', $alloptions, 'options' );

			return $wp_object_cache->delete( "_site_transient_$key", 'site-options' );
		}

		return $wp_object_cache->delete( $key, $group );
	}

	function wp_cache_flush( $local_flush = false ) {
		global $wp_object_cache, $wpdb;

		if ( ! $local_flush ) {
			if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
				$flag = $wpdb->suppress_errors;
				$wpdb->suppress_errors( true );
				$wpdb->query( "INSERT INTO `{$wpdb->options}` (`option_name`, `option_value`, `autoload`) VALUES ( 'gd_system_last_cache_flush', UNIX_TIMESTAMP( NOW() ), 'no' ) ON DUPLICATE KEY UPDATE `option_name` = VALUES ( `option_name` ), `option_value` = VALUES ( `option_value` ), `autoload` = VALUES ( `autoload` );" );
				$wpdb->suppress_errors( $flag );
			}
		}

		return $wp_object_cache->flush();
	}

	function wp_cache_get( $key, $group = '', $force = false ) {
		global $wp_object_cache, $wpdb;

		if ( 'transient' == $group ) {
			$alloptions = $wp_object_cache->get( 'alloptions', 'options' );
			if ( isset( $alloptions["_transient_$key"] ) && isset( $alloptions["_transient_timeout_$key"] ) && $alloptions["_transient_timeout_$key"] > time() ) {
				return maybe_unserialize( $alloptions["_transient_$key"] );
			}
			$transient = $wp_object_cache->get( "_transient_$key", 'options', $force );
			$timeout   = $wp_object_cache->get( "_transient_timeout_$key", 'options', $force );
			if ( false !== $transient && ! empty( $timeout ) && $timeout > time() ) {
				return maybe_unserialize( $transient );
			}
			if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
				$flag = $wpdb->suppress_errors;
				$wpdb->suppress_errors( true );
				$result = $wpdb->get_results(
					$wpdb->prepare(
						"SELECT option_name, option_value FROM `{$wpdb->options}` WHERE option_name IN ( %s, %s ) UNION SELECT 'current_time', UNIX_TIMESTAMP( NOW() ) AS option_value;",
						"_transient_{$key}",
						"_transient_timeout_{$key}"
					),
					ARRAY_A
				);
				$wpdb->suppress_errors( $flag );
				if ( ! empty( $result ) ) {
					$transient    = false;
					$timeout      = false;
					$current_time = time();
					foreach ( $result as $row ) {
						switch ( $row['option_name'] ) {
							case "_transient_$key" :
								$transient = $row['option_value'];
								break;
							case "_transient_timeout_$key" :
								$timeout = $row['option_value'];
								break;
							case 'current_time' :
								$current_time = $row['option_value'];
								break;
						}
					}
					if ( false !== $transient && ! empty( $timeout ) && $timeout > $current_time ) {
						return maybe_unserialize( $transient );
					}
				}
			}

			return false;
		} elseif ( 'site-transient' == $group ) {
			$transient = $wp_object_cache->get( "_site_transient_$key", 'options', $force );
			$timeout   = $wp_object_cache->get( "_site_transient_timeout_$key", 'options', $force );
			if ( false !== $transient && ! empty( $timeout ) && $timeout > time() ) {
				return maybe_unserialize( $transient );
			}
			if ( ! empty( $wpdb ) && $wpdb instanceof wpdb ) {
				$table = $wpdb->options;
				if ( is_multisite() ) {
					$table = $wpdb->sitemeta;
				}
				$flag = $wpdb->suppress_errors;
				$wpdb->suppress_errors( true );
				$result = $wpdb->get_results(
					$wpdb->prepare(
						"SELECT option_name, option_value FROM `{$table}` WHERE option_name IN ( %s, %s ) UNION SELECT 'current_time', UNIX_TIMESTAMP( NOW() ) AS option_value;",
						"_site_transient_{$key}",
						"_site_transient_timeout_{$key}"
					),
					ARRAY_A
				);
				$wpdb->suppress_errors( $flag );
				if ( ! empty( $result ) ) {
					$transient    = false;
					$timeout      = false;
					$current_time = time();
					foreach ( $result as $row ) {
						switch ( $row['option_name'] ) {
							case "_site_transient_$key" :
								$transient = $row['option_value'];
								break;
							case "_site_transient_timeout_$key" :
								$timeout = $row['option_value'];
								break;
							case 'current_time' :
								$current_time = $row['option_value'];
								break;
						}
					}
					if ( false !== $transient && ! empty( $timeout ) && $timeout > $current_time ) {
						return maybe_unserialize( $transient );
					}
				}
			}

			return false;
		} else {
			return $wp_object_cache->get( $key, $group, $force );
		}
	}

	function wp_cache_init() {
		global $wp_object_cache;

		if ( mt_rand( 1, 100 ) == 42 ) {

			wpaas_prune_transients();

		}

		add_action( 'muplugins_loaded', 'wpaas_init_sync_cache' );

		$wp_object_cache = new APCu_Object_Cache();

	}

	function wp_cache_replace( $key, $data, $group = '', $expire = 0 ) {
		global $wp_object_cache;

		return $wp_object_cache->replace( $key, $data, $group, $expire );
	}

	function wp_cache_set( $key, $data, $group = '', $expire = 0 ) {
		global $wp_object_cache;

		if ( defined( 'WP_INSTALLING' ) == false ) {
			if ( 'transient' == $group ) {
				return wpaas_save_transient( $key, $data, $expire );
			} elseif ( 'site-transient' == $group ) {
				return wpaas_save_transient( $key, $data, $expire, true );
			} else {
				return $wp_object_cache->set( $key, $data, $group, $expire );
			}
		} else {
			return $wp_object_cache->delete( $key, $group );
		}
	}

	function wp_cache_switch_to_blog( $blog_id ) {
		global $wp_object_cache;

		return $wp_object_cache->switch_to_blog( $blog_id );
	}

	function wp_cache_add_global_groups( $groups ) {
		global $wp_object_cache;

		$wp_object_cache->add_global_groups( $groups );
	}

	function wp_cache_add_non_persistent_groups( $groups ) {
		global $wp_object_cache;

		$wp_object_cache->add_non_persistent_groups( $groups );
	}

	class GD_APCu_Object_Cache {

		private $prefix = '';
		private $local_cache = array();
		private $global_groups = array();
		private $non_persistent_groups = array();
		private $multisite = false;
		private $blog_prefix = '';

		public function __construct() {
			global $table_prefix;

			$this->multisite   = is_multisite();
			$this->blog_prefix = $this->multisite ? get_current_blog_id() . ':' : '';
			$this->prefix      = DB_HOST . '.' . DB_NAME . '.' . $table_prefix;
		}

		private function get_group( $group ) {
			return empty( $group ) ? 'default' : $group;
		}

		private function get_key( $group, $key ) {
			if ( $this->multisite && ! isset( $this->global_groups[ $group ] ) ) {
				return $this->prefix . '.' . $group . '.' . $this->blog_prefix . ':' . $key;
			} else {
				return $this->prefix . '.' . $group . '.' . $key;
			}
		}

		public function add( $key, $data, $group = 'default', $expire = 0 ) {
			$group = $this->get_group( $group );
			$key   = $this->get_key( $group, $key );

			if ( function_exists( 'wp_suspend_cache_addition' ) && wp_suspend_cache_addition() ) {
				return false;
			}
			if ( isset( $this->local_cache[ $group ][ $key ] ) ) {
				return false;
			}
			// FIXME: Somehow apcu_add does not return false if key already exists
			if ( ! isset( $this->non_persistent_groups[ $group ] ) && apcu_exists( $key ) ) {
				return false;
			}

			if ( is_object( $data ) ) {
				$this->local_cache[ $group ][ $key ] = clone $data;
			} else {
				$this->local_cache[ $group ][ $key ] = $data;
			}

			if ( ! isset( $this->non_persistent_groups[ $group ] ) ) {
				return apcu_add( $key, $data, (int) $expire );
			}

			return true;
		}

		public function add_global_groups( $groups ) {
			if ( is_array( $groups ) ) {
				foreach ( $groups as $group ) {
					$this->global_groups[ $group ] = true;
				}
			} else {
				$this->global_groups[ $groups ] = true;
			}
		}

		public function add_non_persistent_groups( $groups ) {
			if ( is_array( $groups ) ) {
				foreach ( $groups as $group ) {
					$this->non_persistent_groups[ $group ] = true;
				}
			} else {
				$this->non_persistent_groups[ $groups ] = true;
			}
		}

		public function decr( $key, $offset = 1, $group = 'default' ) {
			if ( $offset < 0 ) {
				return $this->incr( $key, abs( $offset ), $group );
			}

			$group = $this->get_group( $group );
			$key   = $this->get_key( $group, $key );

			if ( isset( $this->local_cache[ $group ][ $key ] ) && $this->local_cache[ $group ][ $key ] - $offset >= 0 ) {
				$this->local_cache[ $group ][ $key ] -= $offset;
			} else {
				$this->local_cache[ $group ][ $key ] = 0;
			}

			if ( isset( $this->non_persistent_groups[ $group ] ) ) {
				return $this->local_cache[ $group ][ $key ];
			} else {
				$value = apcu_dec( $key, $offset );
				if ( $value < 0 ) {
					apcu_store( $key, 0 );

					return 0;
				}

				return $value;
			}
		}

		public function delete( $key, $group = 'default', $force = false ) {
			$group = $this->get_group( $group );
			$key   = $this->get_key( $group, $key );

			unset( $this->local_cache[ $group ][ $key ] );
			if ( ! isset( $this->non_persistent_groups[ $group ] ) ) {
				return apcu_delete( $key );
			}

			return true;
		}

		public function flush() {
			$this->local_cache = array();
			// TODO: only clear our own entries
			apcu_clear_cache();

			return true;
		}

		public function get( $key, $group = 'default', $force = false, &$found = null ) {
			$group = $this->get_group( $group );
			$key   = $this->get_key( $group, $key );

			if ( ! $force && isset( $this->local_cache[ $group ][ $key ] ) ) {
				$found = true;
				if ( is_object( $this->local_cache[ $group ][ $key ] ) ) {
					return clone $this->local_cache[ $group ][ $key ];
				} else {
					return $this->local_cache[ $group ][ $key ];
				}
			} elseif ( isset( $this->non_persistent_groups[ $group ] ) ) {
				$found = false;

				return false;
			} else {
				$value = @apcu_fetch( $key, $found );
				if ( $found ) {
					if ( $force ) {
						$this->local_cache[ $group ][ $key ] = $value;
					}

					return $value;
				} else {
					return false;
				}
			}
		}

		public function incr2( $key, $offset = 1, $group = 'default' ) {
			if ( $offset < 0 ) {
				return $this->decr( $key, abs( $offset ), $group );
			}

			$group = $this->get_group( $group );
			$key   = $this->get_key( $group, $key );

			if ( isset( $this->local_cache[ $group ][ $key ] ) && $this->local_cache[ $group ][ $key ] + $offset >= 0 ) {
				$this->local_cache[ $group ][ $key ] += $offset;
			} else {
				$this->local_cache[ $group ][ $key ] = 0;
			}

			if ( isset( $this->non_persistent_groups[ $group ] ) ) {
				return $this->local_cache[ $group ][ $key ];
			} else if ( function_exists( 'apcu_inc' ) ) {
				$value = apcu_inc( $key, $offset );
				if ( $value < 0 ) {
					apcu_store( $key, 0 );

					return 0;
				}

				return $value;
			}

			return false;
		}

		public function replace( $key, $data, $group = 'default', $expire = 0 ) {
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{"id":5073,"date":"2020-09-08T12:14:30","date_gmt":"2020-09-08T10:14:30","guid":{"rendered":"https:\/\/oldpics.net\/?p=5073"},"modified":"2020-09-08T12:14:34","modified_gmt":"2020-09-08T10:14:34","slug":"schienenzeppelin-the-rail-zeppelin-june-1931","status":"publish","type":"post","link":"https:\/\/oldpics.net\/schienenzeppelin-the-rail-zeppelin-june-1931\/","title":{"rendered":"Schienenzeppelin: the Rail Zeppelin, June 1931"},"content":{"rendered":"\n<p><span style=\"font-weight: 400;\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-5074\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931.jpg\" alt=\"Schienenzeppelin- the Rail Zeppelin, June 1931\" width=\"1600\" height=\"900\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931.jpg 1600w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931-300x169.jpg 300w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931-1024x576.jpg 1024w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931-768x432.jpg 768w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931-1536x864.jpg 1536w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-the-Rail-Zeppelin-June-1931-360x203.jpg 360w\" sizes=\"(max-width: 1600px) 100vw, 1600px\" \/>Germans called Schienenzeppelin the \u2018Cigar on the rails.\u2019 This device set the world record speed for railroads, although Count Zeppelin, the inventor of rigid airships, had nothing to do with the project.<\/span><\/p>\n<div id=\"attachment_5075\" style=\"width: 810px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5075\" loading=\"lazy\" class=\"size-full wp-image-5075\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-Russian-predecor-of-the-Schienenzeppelin-designed-by-Abakovskiy-1922..jpg\" alt=\"The Russian predecessor of the Schienenzeppelin, designed by Abakovskiy 1922.\" width=\"800\" height=\"400\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-Russian-predecor-of-the-Schienenzeppelin-designed-by-Abakovskiy-1922..jpg 800w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-Russian-predecor-of-the-Schienenzeppelin-designed-by-Abakovskiy-1922.-300x150.jpg 300w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-Russian-predecor-of-the-Schienenzeppelin-designed-by-Abakovskiy-1922.-768x384.jpg 768w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-Russian-predecor-of-the-Schienenzeppelin-designed-by-Abakovskiy-1922.-360x180.jpg 360w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-5075\" class=\"wp-caption-text\">The Russian predecessor of the Schienenzeppelin, designed by Abakovskiy 1922.<\/p><\/div>\n<h3>A Russian start<\/h3>\n<p><span style=\"font-weight: 400;\">Interestingly, the history of the Schienenzeppelin starts in Russia. A local engineer Abakovskiy completed the construction of a railroad car with an aircraft propeller in 1921. He named it originally &#8220;an aircar.&#8221; This Russian railroad car even made several trips and tragically crashed, taking seven people to the grave, including the inventor.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The Germans still found potential in this tragic story. Thus, engineer Franz Krukenberg created a 26-meter air locomotive with a design in the then fashionable Zeppelin style.<\/span><\/p>\n<h3>Read more:\u00a0<a href=\"https:\/\/oldpics.net\/100-most-important-pictures-in-history\/\">100 most important pictures in history<\/a><\/h3>\n<div id=\"attachment_5076\" style=\"width: 910px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5076\" loading=\"lazy\" class=\"size-full wp-image-5076\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-had-an-extremly-futuristic-design.jpg\" alt=\"Schienenzeppelin had an extremly futuristic design\" width=\"900\" height=\"1200\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-had-an-extremly-futuristic-design.jpg 900w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-had-an-extremly-futuristic-design-225x300.jpg 225w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-had-an-extremly-futuristic-design-768x1024.jpg 768w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-had-an-extremly-futuristic-design-360x480.jpg 360w\" sizes=\"(max-width: 900px) 100vw, 900px\" \/><p id=\"caption-attachment-5076\" class=\"wp-caption-text\">Schienenzeppelin had an extremely futuristic design<\/p><\/div>\n<h3>The speed records of the Schienenzeppelin<\/h3>\n<p><span style=\"font-weight: 400;\">On May 10, 1931, this Schienenzeppelin recorded a speed of 200 kilometers per hour. It was made of aluminum. Its lightweight allowed it to hit the world speed records. The futuristic beauty beat its own record a few months later, hitting 230 kph. Yes, the German industry is good at <a href=\"https:\/\/oldpics.net\/mercedes-is-helping-a-bicycle-to-set-a-speed-record-1962\/\">setting speed records.<\/a> After that, they began to roll this modernist invention all over Germany in order to demonstrate to the public. The Germans could not believe what they saw.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">The Schienenzeppelin could carry up to 40 passengers, but not in luxury. The interior design was kept to a minimum, also due to weight concerns.\u00a0<\/span><\/p>\n<h3>Read more:\u00a0<a href=\"https:\/\/oldpics.net\/all-pulitzer-prize-photos-1942-1967\/\">All Pulitzer Prize photos (1942-1967)<\/a><\/h3>\n<div id=\"attachment_5077\" style=\"width: 2038px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5077\" loading=\"lazy\" class=\"size-full wp-image-5077\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast..jpg\" alt=\"The vehicle was made of aluminium and it was very light and fast.\" width=\"2028\" height=\"1260\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast..jpg 2028w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast.-300x186.jpg 300w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast.-1024x636.jpg 1024w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast.-768x477.jpg 768w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast.-1536x954.jpg 1536w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-vehicle-was-made-of-alluminium-and-it-was-very-light-and-fast.-360x224.jpg 360w\" sizes=\"(max-width: 2028px) 100vw, 2028px\" \/><p id=\"caption-attachment-5077\" class=\"wp-caption-text\">The vehicle was made of aluminum, and it was very light and fast.<\/p><\/div>\n<h3>Schienenzeppelin was impractical<\/h3>\n<p><span style=\"font-weight: 400;\">However, the Schienenzeppelin turned out to be not very practical. The propeller was behind the zeppelin, so it was not possible to attach other cars to it. Schienenzeppelin could only stay as an autonomous and independent car. The trips were expensive and impractical. Aircar did not climb hills well and did not have a reverse gear.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Many believed that the rotating propeller was very dangerous for passengers. The express created powerful air currents when passing by at high speed. Rail Zeppelin was a pretty noisy beast. And the railroad pavements themselves weren&#8217;t perfect enough to handle ultra-high speeds.<\/span><\/p>\n<div id=\"attachment_5078\" style=\"width: 1010px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5078\" loading=\"lazy\" class=\"size-full wp-image-5078\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Nazi-used-the-Schienenzeppelin-to-demonstrate-German-tech-superiority.jpg\" alt=\"Nazi used the Schienenzeppelin to demonstrate German tech superiority\" width=\"1000\" height=\"670\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Nazi-used-the-Schienenzeppelin-to-demonstrate-German-tech-superiority.jpg 1000w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Nazi-used-the-Schienenzeppelin-to-demonstrate-German-tech-superiority-300x201.jpg 300w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Nazi-used-the-Schienenzeppelin-to-demonstrate-German-tech-superiority-768x515.jpg 768w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Nazi-used-the-Schienenzeppelin-to-demonstrate-German-tech-superiority-360x241.jpg 360w\" sizes=\"(max-width: 1000px) 100vw, 1000px\" \/><p id=\"caption-attachment-5078\" class=\"wp-caption-text\">Nazis used Rail Zeppelin to demonstrate German tech superiority.<\/p><\/div>\n<h3>The last trip\u00a0 of the Schienenzeppelin<\/h3>\n<p><span style=\"font-weight: 400;\">In short, operational shortcomings outweighed the beauty of the engineering idea. In 1939, the Germans disassembled the Rail Zeppelin. Schienenzeppelin completed its last trip on April 4, 1939. All the materials filled the needs of the German military industry during WWII.<\/span><\/p>\n<p><span style=\"font-weight: 400;\">Franz Kruckenberg continued to design trains for railways and died in 1965 at the age of 82.<\/span><\/p>\n<div id=\"attachment_5079\" style=\"width: 442px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5079\" loading=\"lazy\" class=\"size-full wp-image-5079\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-team.-Herr-Kruckenberg-is-second-from-the-left.jpg\" alt=\"Schienenzeppelin team. Herr Kruckenberg is second from the left\" width=\"432\" height=\"640\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-team.-Herr-Kruckenberg-is-second-from-the-left.jpg 432w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-team.-Herr-Kruckenberg-is-second-from-the-left-203x300.jpg 203w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/Schienenzeppelin-team.-Herr-Kruckenberg-is-second-from-the-left-360x533.jpg 360w\" sizes=\"(max-width: 432px) 100vw, 432px\" \/><p id=\"caption-attachment-5079\" class=\"wp-caption-text\">Rail Zeppelin team. Herr Kruckenberg is second from the left<\/p><\/div>\n<div id=\"attachment_5080\" style=\"width: 610px\" class=\"wp-caption aligncenter\"><img aria-describedby=\"caption-attachment-5080\" loading=\"lazy\" class=\"size-full wp-image-5080\" src=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-construction-phase-1931.jpg\" alt=\"The construction phase, 1931\" width=\"600\" height=\"339\" srcset=\"https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-construction-phase-1931.jpg 600w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-construction-phase-1931-300x170.jpg 300w, https:\/\/oldpics.net\/wp-content\/uploads\/2020\/09\/The-construction-phase-1931-360x203.jpg 360w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><p id=\"caption-attachment-5080\" class=\"wp-caption-text\">The construction phase, 1931<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Germans called Schienenzeppelin the \u2018Cigar on the rails.\u2019 This device set the world record speed for railroads, although Count Zeppelin, the inventor&#8230;<\/p>\n","protected":false},"author":4,"featured_media":5074,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[42,37,68],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Schienenzeppelin: the Rail Zeppelin, June 1931 - Old Pictures<\/title>\n<meta name=\"description\" content=\"Schienenzeppelin was the one of the most incredible invention of the German Railroad industry in the 1930s. 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