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An interchange station (in the UK, most Commonwealth countries, Hong Kong  and Ireland) or a transfer station (in Canada and the USA) is a train station for more than one railway route in a public transport system, and allows passengers to change from one route to another.
Transfer may occur within the same mode, or between rail modes, or to buses (for stations with bus termini attached). Such stations usually have more platforms than single route stations. Passengers may be required to pay extra fare for the interchange if they leave a paid area.
In most rapid transit, an interchange station is a stop at which a passenger can change from one line to another without incurring another full fare or having to leave the station proper.
Some interchange stations offer only transfer between routes and do not have the ability for passengers to enter or exit the network, for instance Cornbrook on the Manchester Metrolink light rail system in Manchester, United Kingdom (although passenger entrances and exits for the station were later established in 2005), and Shing Mun Tunnels Bus Interchange in the New Territories, Hong Kong. Manhattan Transfer (PRR station) on the Pennsylvania Railroad was located outside Newark, New Jersey in a relatively isolated area, and was used primarily for passenger interchange.
Sometimes cross-platform interchange is offered between mainline railways and city metro systems, such as Barking station and Stratford station in London, England, and Nam Cheong Station in New Kowloon, Hong Kong.
In some cases, no dedicated underground passage or footbridge is provided, and therefore passengers have to transfer between two parts of a station through city streets. Examples include Kuramae Station of Toei in Tokyo, Japan and Lexington Avenue-59th Street/Lexington Avenue–63rd Street stations in New York City, United States. In many cases, electronic ticketing allows transferring passengers re-admission to the transit system without paying fare a second time, as if they had never left the fare control area in the station (this process is called a "free out-of-system transfer").
There are also bus interchanges, where people can change between different bus routes with no extra fare or only the differences of the fares of the two routes. Examples include Tai Lam Tunnel Bus Interchange and Shing Mun Tunnel Bus Interchange in the New Territories, Hong Kong, and in the downtown of Lafayette, Indiana, United States.
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