British Rail Class 404

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Southern Railway 4-COR, 4-BUF, 4-RES, 4-GRI British Rail Class 404
4-COR set 3101 passing Weybridge on 1 April 1958
In service	1937–1972
Manufacturer	SR Lancing Works (underframes), Eastleigh Works (bodywork)
Constructed	1937-38
Formation	Power car + 2 trailer cars + power car
Operators	Southern Railway, British Railways
Specifications
Train length	265 ft 2 in (80.82 m)
Width	9 ft 8+1⁄2 in (2.96 m)
Maximum speed	75 mph (121 km/h)
Weight	158 long tons 5 cwt (354,500 lb or 160.8 t)
Traction motors	Four Metropolitan Vickers[1]
Power output	4 x 225 hp (168 kW) total 900 hp (671 kW)
Electric system(s)	600 - 750 V DC third rail
Current collector(s)	Contact shoe
UIC classification	Bo′2′+2′2′+2′2′+2′Bo′
Braking system(s)	Automatic Air
Coupling system	Screw-link
Multiple working	Standard SR system
Track gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge

The Southern Railway (SR) gave the designations 4-COR, 4-RES, 4-BUF and 4-GRI to the different types of electric multiple unit built to work the route between London Waterloo and Portsmouth Harbour. The 4-COR type units survived long enough in British Rail ownership to be allocated TOPS Class 404. The COR designation had previously been used for the 6-PUL units and was reused by them during World War II when the Pullman car was stored, but this stock was different from the 4-COR units.