British Rail 11001

British Rail 11001

11001

Type and origin Power type Diesel-mechanical Builder British Railways’ Ashford Works Order number 3410 Build date 1949 Total produced 1

Specifications Configuration 0-6-0 dm UIC class C Gauge 4 ft 8 ^1⁄2 in (1,435 mm) standard gauge Wheel diameter 4 ft 6 in (1.372 m) Length 33 ft (10.058 m) Loco weight 49.45 long tons (50.24 t; 55.38 short tons) Prime mover Paxman RPH Series 1 Transmission Mechanical, SSS Powerflow 3-speed gearbox Train heating None

Performance figures Maximum speed 36 mph (58 km/h) Power output Engine: 500 bhp (373 kW) Tractive effort 33,500 lbf (149.0 kN)

Career Operators British Railways Numbers 11001 Axle load class Route availability Retired August 1959 Disposition Scrapped, December 1959

11001 was one of the first British Railways diesel locomotives, 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 brake horsepower (370 kW) 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, with 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.

Its main duties were on branch lines and shunting. It survived until 1959, when it was withdrawn in August and cut up at Ashford Works in December.

Oddly, the locomotive's controls were laid out as in a steam locomotive, because there were at that time no drivers with experience of driving diesel engines.

In fiction

Dennis and Norman, from Thomas & Friends, are based on 11001.

External links

• Richard Carr's Paxman History pages