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British Rail Class 377 Locomotive

The British Rail Class 377 Electrostar is a British dual-voltage electric multiple unit train (EMU) built by Bombardier Transportation at its Derby Litchurch Lane Works, from 2001 to 2014. The Electrostar family is the most numerous type of EMU built in the post-privatisation period of Britain's railways.
The class forms the major part of the Govia Thameslink Railway (GTR) fleet for Southern services and now also supplement some Southeastern services. They are primarily seen on services in the south of England.