British Rail Classes 316 and 457

British Rail Classes 316 and 457
67300 at Electric Railway Museum, Warwickshire
In service	1989 (as Class 457) 1990 (as Class 316)
Manufacturer	British Rail Engineering Limited
Built at	Derby Litchurch Lane Works
Family name	BR Second Generation (Mark 3)
Number built	1
Formation	4 cars
Operators	Network SouthEast
Specifications
Electric system(s)	750 V DC third rail 25 kV 50 Hz AC overhead lines (Class 316)
Current collector(s)	Contact shoe (Class 457) Pantograph (Class 316)
Track gauge	1,435 mm (4 ft 8+1⁄2 in) standard gauge

Class 316 and Class 457 were TOPS classifications assigned to a single electric multiple unit (EMU) at different stages of its use as a prototype for the Networker series.