LMS diesel shunter 1831

infobox Locomotive
name = LMS 1831
powertype = Diesel Hydraulic

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caption = An official photograph of No. 1831.
builder = LMS, Derby Works
builddate = 1931
whytetype = 0-6-0DH
gauge = RailGauge|ussg
wheeldiameter = 4 ft 7in
wheelbase = 15 ft 8 in
length = 30 ft 3¾ in (9.2 m)
width = 8 ft 7½ in (2.6 m)
height = 12 ft 9 in (3.9 m)
weight = 46 tons 2 cwt (46.8 tonnes)
fuelc

enginetype = Davey Paxman 6-cyl of 400 hp (298 kW) at 750 rpm; later 300 hp (224 kW)
transmission = Haslam & Newton
topspeed = 25 mph
tractiveeffort = 22,400 lbf (100 kN);
later 20,000 lbf (89 kN)
locobrakes = Air brake (independent)
trainbrakes = Vacuum brake
railroad = London, Midland and Scottish Railway
numinclass = 1
roadnumber = 1831
deliverydate = Testing: December 1932;
In stock: May 1934
retiredate = September 1939
disposition = Rebuilt 1940 in to mobile power unit; scrapped 1950s

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 It was withdrawn from service in September 1939 and converted to a mobile power unit, emerging in its new guise as MPU3 in November 1940.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.