The LNER Class Y10 was a class of two 0-4-0T geared steam locomotives built by

Sentinel Waggon Works Sentinel Waggon Works Ltd was a British company based in Shrewsbury, Shropshire that made steam-powered lorries ( steam wagons), railway locomotives, and later, diesel engined lorries, buses and locomotives. History Alley & MacLellan, Se ...

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 The first was for an ex- North British Railway 0-4-0 steam tender locomotive, withdrawn 1925. Both the Sentinels passed into British Railways ownership in 1948 but 8187 was withdrawn almost immediately. Number 8186 was allocated the BR number 68186, but never actually carried it, and was withdrawn in 1952.

Power unit

The

superheated A superheater is a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheated steam is used in steam turbines for electricity generation, steam engines, and in processes such as steam reforming. There are ...

vertical water-tube boiler and the

motor An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy. Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power g ...

were similar to those used in Sentinel

steam wagon A steam wagon (or steam lorry, steam waggon or steamtruck) is a steam-powered truck for carrying freight. It was the earliest form of lorry (truck) and came in two basic forms: ''overtype'' and ''undertype'', the distinction being the position ...

s. Each locomotive had two 2-cylinder engines, giving a total of . The engines had

poppet valve A poppet valve (also called mushroom valve) is a valve typically used to control the timing and quantity of gas or vapor flow into an engine. It consists of a hole or open-ended chamber, usually round or oval in cross-section, and a plug, usua ...

s 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.

Transmission

Final drive to the wheels was by

sprocket A sprocket, sprocket-wheel or chainwheel is a profiled wheel with teeth that mesh with a roller chain, chain, Caterpillar track, track or other perforated or indented material. The name 'sprocket' applies generally to any wheel upon which radial ...

and chain. There was a two-speed

gearbox Propulsion transmission is the mode of transmitting and controlling propulsion power of a machine. The term ''transmission'' properly refers to the whole drivetrain, including clutch, gearbox, prop shaft (for rear-wheel drive vehicles), differe ...

but gears could only be changed while the locomotive was stationary. Tractive effort was: * Low gear * High gear

Usage

These locomotives were intended for service on the

Wisbech and Upwell Tramway The Wisbech and Upwell Tramway was a rural standard gauge tramway in East Anglia. It was built by the Great Eastern Railway between Wisbech, Isle of Ely, Cambridgeshire and Upwell, now in Norfolk to carry agricultural produce. Although called ...

and had several

tram engine A tram engine is a steam locomotive specially built, or modified, to run on a street, or roadside, tramway track. Legal requirements In the steam locomotive era, tram engines had to comply with certain legal requirements, although these varie ...

features. These included cowcatchers and sideplates and a cab at each end, similar to the

GER Class C53 The GER Class C53 was a class of twelve steam tram locomotives designed by James Holden for the Great Eastern Railway. They passed to the London and North Eastern Railway at the grouping, and received the LNER classification J70. History The ...

locomotives which already worked on the line. 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.

References

* Sentinel locomotives Y10 0-4-0T locomotives Railway locomotives introduced in 1930 Tram engines Standard gauge steam locomotives of Great Britain Scrapped locomotives {{England-steam-loco-stub