A split platform is a railroad term used to describe a railway station that has a platform for each track, split on to two or more levels.
This setup is not common in North American railroad stations, but is found in some places in Europe such as the London Underground. Examples of this layout in the United States are Rosslyn Station on the Washington Metro's Blue and Orange Lines, Pentagon Station on the Washington Metro's Blue and Yellow Lines and Harvard and Porter stations on the Boston-Cambridge MBTA Red Line. They are also featured in downtown Oakland, California on BART's 12th and 19th street stations, as well as Los Angeles Metro Rail's Wilshire / Vermont Station. Milan Metro features such setup in Sant'Agostino station on line M2, and in all the stations between Crocetta and Turati on line M3.
A similar configuration was planned for the downtown San Francisco stations but the lower level was instead used for San Francisco Municipal Railroad trains instead.
In Asia, Jingan and Yongan Market on the Taipei Metro also feature split platform configurations (in the form of stacked platforms), as well as Central, Wan Chai, Causeway Bay, Tin Hau, North Point, and Sai Wan Ho stations on MTR's Island Line on Hong Kong Island. Promenade Station in Singapore also featured split platform (in the form of side platforms).
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