British Rail 11001

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British Rail 11001
Type and origin
Power type Diesel-mechanical
Builder British RailwaysAshford Works
Order number 3410
Build date 1949
Total produced 1
 • Whyte 0-6-0 dm
 • UIC C
Gauge 4 ft 8 12 in (1,435 mm) standard gauge
Wheel diameter 4 ft 6 in (1.372 m)
Loco weight 49.45 long tons (50.24 t)
Prime mover Paxman RPH Series 1
Transmission Mechanical, SSS Powerflow 3-speed gearbox
Train heating None
Performance figures
Top speed 36 mph (58 km/h)
Power output Engine: 500 bhp (373 kW)
Tractive effort 33,500 lbf (149.0 kN)
Railroad(s) British Railways
Number 11001
Axle load class Route availability
Retired August 1959
Disposition Scrapped, December 1959

11001 was one of the first British Railways diesel locomotives. It was built in 1949 at British Railways' Ashford Works. It was designed by O. V. S. Bulleid when he was Chief Mechanical Engineer of the Southern Railway. It was powered by a Paxman RPH Series 1 engine, capable of delivering 500 bhp at 1,250 rpm. It was driven via a Vulcan Sinclair fluid coupling to an SSS (Synchro-Self-Shifting) Powerflow gearbox. The gearbox provided three forward and reverse gears in either high or low range. It gave a top speed ranging from 5 mph (8 km/h) in 1st gear, low range up to 36 mph (58 km/h). It had an 0-6-0 wheel formation.