Cross Platform Interchange

A cross-platform interchange is a type of interchange between different lines in a metro system.

        A cross-platform interchange is a type of interchange between different lines in a metro system. The term originates with the London Underground; such layouts exist in other networks but are not commonly so named. In the United States, it is often referred to as simply a "transfer".It occurs in a system with island platforms, with a single platform in between the two directions of travel, or two side platforms between the tracks, connected by level corridors. Passengers do not need to move to another platform level for transfer, thus increasing the efficiency of commuting. Building a cross-platform interchange may be costly due to the complexity of railtrack alignment, especially so if the railway operators insistently arrange their track without flat crossings. A common two-station cross-platform interchange configuration consists of two similar directions of two different lines sharing an island platform in one station, and two opposite directions of two different lines sharing an island platform in the other station.

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