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Cross-platform InterchangeA 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. It occurs in a system with island platforms: where there is a single platform in between the two directions of travel, or two platforms between the tracks, connected by level corridors. In a cross-platform interchange, instead of the two opposite directions of a single line sharing an island platform, two similar directions of two different lines share it. In London's deep-level tube network, these usually occur in pairs for both directions of two lines. This allows for extremely quick and convenient interchange. The effect is that the two lines, despite having completely separate operation, can be treated by passengers as branches of a single network. Below is a simplified diagram of one such interchange at Oxford Circus tube station, between the Bakerloo Line and the Victoria Line:
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