This polygon occupies the area containing the original buildings of the Doncaster Plant Works. The works were opened in 1853 and expanded in 1865. It constructs and repairs locomotives. Famous locomotives made at the plant include the Flying Scotsman and the Mallard. The Mallard holds the world speed record for a steam locomotive. The construction of the works provided a great impetus to the development of the surrounding area leading to the construction of housing a sports ground and church for workers. Prior to the construction of the works, the area was probably a wetland used as pasture. Legibility of the former character is invisible.