British Rail 10100

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.

British Railways 10100
The Fell Diesel at Derby Works in June 1957
Power type	Diesel-mechanical
Builder	LMS, Derby Works
Build date	1951
Configuration	4-8-4
UIC classification	2′D2′
Gauge
Leading wheel diameter	39 in (0.991 m)
Driver diameter	51 in (1.295 m)
Minimum curve	5 chains (101 m)
Wheelbase	41 ft 4 in (12.60 m)
Length	50 ft 0 in (15.24 m)
Width	9 ft 0 in (2.74 m)
Height	13 ft 0 in (3.96 m)
Locomotive weight
Fuel capacity	720 imp gal (3,300 l; 860 US gal)
Coolant capacity	60 imp gal (270 l; 72 US gal)
Water capacity	500 imp gal (2,300 l; 600 US gal)
Prime mover	Paxman 12RPH, x 4
Cylinder size
Transmission	Vulcan Sinclair SCRD fluid; Fell central gearbox
Power output	2,000 bhp (1,500 kW) at 1,500 rpm
Tractive effort	25,000 lbf (111 kN)
Train heating	Steam generator
Locomotive brakeforce	38 long tons-force (380 kN)
Train brakes	Vacuum
Power class	6P5F, later Type 4
Nicknames	Fell Diesel Locomotive
Withdrawn	15 October 1958
Scrapped	Derby Works, July 1960