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Class 316 / 457 Networker Testbed

To help develop the Class 465 "Networker" electric multiple unit British Rail took four coaches from the Class 210 prototype diesel electric multiple unit and used them as a test bed, firstly as the Class 457 for DC third rail and later as the Class 316 for AC overhead [1].

The former Class 210s were converted at RTC Derby and then ran for a while on Southern Region. The 457 was fitted with three-phase traction motors which allowed for significant energy savings over earlier types of motor [2].
67300 when at the Electric Railway Museum

Information
Number built: 4 (1 4-car set)
Built: 1989-90 (Class 210s originally built 1981)
Builder: BREL Derby / RTC Derby
Engine: Brush three-phase traction motors
(750v DC third rail (457) 25kV AC OHLE (316))
Power: 1, 140 hp (850 kW) 
Formation: (457) Driving Motor Standard Open (DMSO)+Trailer Standard Open (TSO)+TSO+DMSO
(316) DMSO+Pantograph Trailer Standard Open (PTSO)+TSO+DMSO

Later they returned to Derby and were converted to AC traction by inserting a PTSO from a Class 313 and worked AC electrified lines North of the Thames. Of the four cars used two were later converted to form part of Class 455/9 EMUs. One car, 67300, has been preserved.
Side view of 67300's cab

The other end of 67300, it wears Network South East livery

[1] Colin J Marsden, DMU and EMU Recognition Guide (Ian Allan, 2013) p. 355
[2] Alec Swain, Overhead Line Multiple Units (Ian Allan, 1990) p. 80