London Underground O And P Stock
O Stock and P Stock electric multiple units were built for the Metropolitan Line and Hammersmith & City Line in 1937–1940. From 1955 the electrical equipment was replaced and converted units were reclassified with a leading C making CO Stock and CP Stock. They last ran in service in 1981, having been replaced by C Stock and D Stock units.
Read more about London Underground O And P Stock: History, War Time Losses, P1 Stock, Numbering, Preservation
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