Pipeline

Pipeline is a large multiplayer map featured in Call of Duty 4: Modern Warfare.

Overview
Pipeline is a gloomy setting centered around an abandoned rail yard in Russia, with a large extent of overgrown grassland. There are two large warehouses in the center of the map which often sees the main concentration of fighting. The north warehouse has a small room players can hide in and ladders leading to a catwalk which grants access to the roof. The south warehouse has a u-shaped upper level looking over the ground floor and office rooms. Additionally there is a entrance to an underground tunnel. This tunnels leads to the north-west and north-east sections of the map.

This map's layout supports a variety of play-styles, with the warehouses and tunnel encouraging frantic close-quarters action and the surrounding areas supporting mid to long-range action.

Trivia

 * In the mission "One Shot, One Kill", this map can be seen in the distance, and on this map, the player can also see the building where Price snipes Imran Zakhaev.
 * In Call of Duty 2, one of the early missions involves the player crawling through a pipe at the beginning of the level. When he/she crawls through completely, they end up in what appears to be Warehouse 2 of this map. It is almost identical, with the small passageway that runs under the whole level present in the Call of Duty 2 version.
 * The warehouses on this map resemble those on the map Depot from Call of Duty.
 * In Call of Duty: Modern Warfare: Reflex Edition, the car behind the building with the mounted MG isn't there.
 * The three-floored building with the metal walkway that appears in the centre of this map is reused in the "Back on the Grid" mission set in Africa in Call of Duty: Modern Warfare 3.