British Rail Class 201

The British Rail Class 201 (or 6S) six-car diesel-electric multiple units (DEMUs) were built in 1957–1958 at Eastleigh and underframes were built at Ashford.

British Rail Class 201
1004 at London Cannon Street in 1984
In service1957–1986
ManufacturerEastleigh and Ashford Works
Number built42 vehicles (7 units)
Number preserved1 unit
FormationDMBSO-TSOL-TSOL-TFK-TSOL-DMBSO
OperatorsSouthern Region of British Railways
Specifications
Car body constructionSteel
Car length17.67 m (58 ft 0 in)
Width2.74 m (9 ft 0 in)
Height3.82 m (12 ft 6 in)
DoorsHinged slam (now centrally locked)
Maximum speed75 mph (121 km/h)
Weight55 long tons (56 t; 62 short tons)
Traction systemDEMU
Prime mover(s)English Electric 4SRKT Mark II, 2 per set
Traction motorsEnglish-Electric EE507 traction motors, 4 per set
Power output1,000 hp (750 kW)
BogiesBR Standard. ExEMU coaches Commonwealth or B5
Braking system(s)Air/EP
Coupling systemDrop-head buck-eye
Multiple workingwith Classes 201 to 207
Track gauge1,435 mm (4 ft 8+12 in) standard gauge

The Southern Region Class 201-207 DEMUs are nicknamed 'Thumpers' due to the noise they made while in motion, owing to the four cylinder engines.

These units were built for the London-Hastings line, with a narrow body profile to accommodate the restricted tunnel loading gauge on that line.

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