British Rail 10100

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British Railways 10100
Derby works fell diesel geograph-2390424-by-Ben-Brooksbank.jpg
The Fell Diesel at Derby Works in June 1957
Type and origin
Power typeDiesel-mechanical
BuilderLMS, Derby Works
Build date1951
 • Whyte4-8-4
 • UIC2′D2′
Gauge4 ft 8 12 in (1,435 mm) standard gauge
Leading dia.39 in (0.991 m)
Driver dia.51 in (1.295 m)
Minimum curve5 chains (101 m)
Wheelbase41 ft 4 in (12.60 m)
Length50 ft 0 in (15.24 m)
Width9 ft 0 in (2.74 m)
Height13 ft 0 in (3.96 m)
Loco weight120 long tons (122 t; 134 short tons)
Fuel capacity720 imp gal (3,300 l; 860 US gal)
Coolant cap.60 imp gal (270 l; 72 US gal)
Water cap500 imp gal (2,300 l; 600 US gal)
Prime moverPaxman 12RPH, x 4
Cylinder size7 in × 7+34 in (178 mm × 197 mm)
TransmissionVulcan Sinclair SCRD fluid; Fell central gearbox
Train heatingSteam generator
Train brakesVacuum
Performance figures
Maximum speed84 mph (135 km/h)
Power output2,000 bhp (1,500 kW) at 1,500 rpm
Tractive effort25,000 lbf (111 kN)
Brakeforce38 long tons-force (380 kN)
OperatorsBritish Railways
Power class6P5F, later Type 4
NicknamesFell Diesel Locomotive
Withdrawn15 October 1958
ScrappedDerby Works, July 1960

British Railways 10100 was an unusual experimental diesel locomotive known informally as The Fell Diesel Locomotive (after Lt. Col. L.F.R. Fell, who was one of the designers). It was the joint production of Davey Paxman & Co, Shell Refining & Marketing Co and Lt-Col L.F.R. Fell, built for them by the London, Midland and Scottish Railway at Derby. Sir Harry Ricardo was also involved. By the time it emerged in 1950, nationalisation had taken place and it carried British Railways livery. The locomotive had six diesel engines, four of them used for traction. The auxiliary engines drove the pressure-chargers for the main engines and the purpose of this arrangement was to enable the main engines to deliver very high torque at low crankshaft speed.