LMS diesel shunter 1831

An official photograph of No. 1831.

This was the original experimental shunter, nominally rebuilt by the Midland Railway's Derby Works from a 1377 Class 0-6-0T steam locomotive originally built in September 1892 by the Vulcan Foundry, whose number it inherited (1831), though very little of the steam locomotive was actually re-used. Of itself, it was not very successful, but it did provide useful data for the further development of the diesel shunter design. It was withdrawn from service in September 1939 and converted to a mobile power unit, emerging in its new guise as MPU3 in November 1940. It was scrapped in the 1950s, though sources disagree exactly when.

LMS 1831
Numbering	1831; later MPU3 in departmental stock
Wheel arrangement	0-6-0DH
Introduced	Testing: December 1932; In stock: May 1934
Builder	LMS, Derby Works
Engine	Davey Paxman 6-cyl of 400 hp (298 kW) at 750 rpm; later 300 hp (224 kW)
Transmission	Haslam & Newton
Max. tractive effort	22400 lbf (100 kN); later 20000 lbf (89 kN)
Brakes	Air locomotive brake; Vacuum train brake
Length	30 ft 3.75 in (9.2 m)
Width	8 ft 7.5 in (2.6 m)
Height	12 ft 9 in (3.9 m)
Weight	46 t 2 cwt (46.8 t)
Wheel diameter	4 ft 7 in
Wheelbase	15 ft 8 in
Maximum Speed	25 mph
Fuel capacity	140 imp gal (636 L)
Heating Supply	None