British Rail 11001

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.

British Rail 11001
Type and origin Power type Diesel-mechanical Builder British Railways’ Ashford Works Order number 3410 Build date 1949 Total produced 1
Specifications Configuration: ​  • Whyte 0-6-0 dm  • UIC C Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Wheel diameter 4 feet 6 inches (1.37 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 Power output Engine: 500 brake horsepower (370 kW) Tractive effort 33,500 pounds-force (149 kN)
Career Axle load class Route availability Retired August 1959 Disposition Scrapped, December 1959