British Rail Class 404
| Southern Railway 4-COR, 4-BUF, 4-RES, 4-GRI British Rail Class 404 | |
|---|---|
 4-COR set 3101 passing Weybridge in 1958 | |
| In service | 1937–1972 |
| Manufacturers | 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 |
| Power output | 4 x 225 hp (168 kW) total 900 hp (671 kW) |
| Electric system | 600 - 750 V DC third rail |
| Current collection | Contact shoe |
| UIC classification | Bo′2′+2′2′+2′2′+2′Bo′ |
| Braking system | 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.