The LNER Class Y1 was a class of 0-4-0 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 1925. They passed into British Railways ownership in 1948 and were numbered 68130-68153 but 68134 was withdrawn almost immediately and may not have carried its BR number.

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

engine 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 ...

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. There were variations within the class as regards boiler size and fuel capacity and these were denoted by sub-classes Y1/1 to Y1/4. 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 chain. Some engines had a gear ratio of 11:25 and some 9:25. Tractive effort was: * Ratio 11:25, 7,260 lbf (68130-68142 and 68152-68153) * Ratio 9:25, 8,870 lbf (68143-68151)

Sub-classes

* Y1/1, 68130-68135 and 68152 (total 7) * Y1/2, 68137, 68138, 68140-68151, 68153 (total 15) * Y1/3, 68139 (total 1) * Y1/4, 68136 (total 1) There is disagreement between sources. According to LNER Encyclopedia there were six Y1/1s and sixteen Y1/2s.

Preservation

* Class Y1 number 68153 is preserved on the

Middleton Railway The Middleton Railway is the world's oldest continuously working railway, situated in the English city of Leeds. It was founded in 1758 and is now a heritage railway, run by volunteers from The Middleton Railway Trust Ltd. since 1960. The rail ...

References

External links

Middleton Railway Stock List Sentinel
Sentinel locomotives Y01 0-4-0T locomotives Railway locomotives introduced in 1925 Standard gauge steam locomotives of Great Britain {{UK-steam-loco-stub Shunting locomotives