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British Rail 11001
Power type Diesel-mechanical
Builder British Railways’ Ashford Works
Order number 3410
Build date 1949
Total production 1
Configuration 0-6-0 dm
UIC classification C
Gauge 4 ft 8 12 in (1,435 mm)
Wheel diameter 4 feet 6 inches (1.37 m)
Locomotive weight 49.45 long tons (50.24 t)
Prime mover Paxman RPH Series 1
Transmission Mechanical, SSS Powerflow 3-speed gearbox
Top speed 36 miles per hour (58 km/h)
Power output Engine: 500 brake horsepower (370 kW)
Tractive effort 33,500 pounds-force (149 kN)
Train heating None
Career 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.

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