British Rail 11001

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British Rail 11001
11001 British Rail Diesel-mechanical locomotive.jpg
11001
Type and origin
Power typeDiesel-mechanical
BuilderBR Ashford railway works
Order number3410
Build date1 February 1949 (1949-02-01)
Total produced1
Specifications
Configuration:
​
 •  Whyte 0-6-0 DM
 •  UIC C
Gauge 4 ft 8+1⁄2 in (1,435 mm) standard gauge
Wheel diameter4 ft 6 in (1.372 m)
Length33 ft 3 in (10.13 m)
Loco weight49.45 long tons (50.24  t; 55.38 short tons)
Prime mover Paxman RPH Series 1
TransmissionMechanical, SSS Powerflow 3-speed gearbox
Train heatingNone
Performance figures
Maximum speed45 mph (72 km/h)
Power outputEngine: 500  bhp (373  kW)
Tractive effort 33,500 lbf (149.0 kN)
Career
OperatorsBritish Railways
Numbers11001
Axle load class Route availability
Retired8 August 1959
Disposition Scrapped at Ashford Works on 31 December 1959

11001 was one of the first British Railways diesel locomotives, built in 1949 at British Railways' Ashford railway works. It was designed by Oliver 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. [1] It was driven via a Vulcan-Sinclair fluid coupling to an SSS (synchro-self-shifting) Powerflow gearbox. [2] 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 a 0-6-0 wheel formation, driven by rods from a rear jackshaft on the final drive, and with Bulleid's favoured BFB wheels. [3] [4]

Its main duties were on branch lines and shunting around Norwood Junction, working goods services on the Caterham line during the 1950s. [5] During 1952, it was trialled at Stourton marshalling yard in Leeds. [4] Following a gearbox failure in 1958, it was stored at Ashford, before withdrawal in August 1959. [4] It was cut up at Ashford in December 1959. [2]

References

  1. ↑ "Bulleid's Diesel-mechanical Shunter '11001'". Building Bulleid's Locos. Retrieved 16 October 2025.
  2. 1 2 "No 11001 - Mixed Traffic Locomotive". Richard Carr's Paxman History Pages. Retrieved 16 October 2025.
  3. ↑ "The Southern's 11001 diesel shunter". The BR Chronicles Part 1:1948-1952. Kelsey Media. 2021. p. 71.
  4. 1 2 3 Boocock, C (2020). Oliver Bulleid's locomotives. Pen & Sword. pp. 110–112. ISBN   9781526749239.
  5. ↑ Spence, Jeoffroy (1986). The Caterham Railway. Oakwood Press. p. 115. ISBN   9780853613251.
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