LNER Class Y10
|LNER Class Y10|
|Designer||Sentinel Waggon Works|
|Builder||Sentinel Waggon Works|
|Configuration||0-4-0 geared tank|
|Gauge||4 ft 8 1⁄2 in (1,435 mm)|
|Driver diameter||3 ft 2 in (0.97 m)|
|Locomotive weight||23.95 long tons (24.33 t; 26.82 short tons)|
|Boiler pressure||275 psi (1.90 MPa)
water tube boiler
|Cylinder size||6 3⁄4 in × 9 in (171.45 mm × 228.60 mm)|
|Tractive effort||see text|
The LNER Class Y10 was a class of 0-4-0 geared steam locomotives built by Sentinel Waggon Works for the London and North Eastern Railway and introduced in 1930. The LNER numbered them 8403 and 8404 but they were later re-numbered 8186 and 8187. This was the second use of the classification Y10 by the LNER. The first was for an ex-North British Railway 0-4-0 steam tender locomotive, withdrawn 1925.
Both the Sentinels passed into British Railways ownership in 1948 but 8187 was withdrawn almost immediately. Number 8186 was allocated the BR number 68186, but never actually carried it, and was withdrawn in 1952.
The superheated vertical water-tube boiler and the motor were similar to those used in Sentinel steam wagons. Each locomotive had two 2-cylinder engines, giving a total of 200 horsepower (150 kW). The engines had poppet valves and reversing was by sliding camshaft. The advantage of the water-tube boiler was that steam could be raised much more quickly than with a conventional fire-tube boiler.
- Low gear 11,435 lbf (50.87 kN)
- High gear 7,965 lbf (35.43 kN)
They were not a great success on the Wisbech and Upwell and both were moved to Yarmouth in May 1931 to work the quayside line.
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