LNER Class Y1
Encyclopedia
The LNER Class Y1 was a class of 0-4-0
geared steam locomotive
s built by Sentinel Waggon Works
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 They passed into British Railways ownership in 1948 and were numbered 68130-68153 but 68134 was withdrawn almost immediately and may not have carried its BR number.
vertical water-tube boiler
and the engine
were similar to those used in Sentinel steam wagon
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
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
.
. Some engines had a gear ratio of 11:25 and some 9:25. Tractive effort was:
There is disagreement between sources. According to LNER Encyclopedia there were six Y1/1s and sixteen Y1/2s.
0-4-0
Under the Whyte notation for the classification of steam locomotives, 0-4-0 represents one of the simplest possible types, that with two axles and four coupled wheels, all of which are driven...
geared steam locomotive
Geared steam locomotive
A geared steam locomotive is a type of steam locomotive which uses reduction gearing in the drivetrain, as opposed to the common directly driven design....
s built by Sentinel Waggon Works
Sentinel Waggon Works
Sentinel Waggon Works Ltd was a British company based in Shrewsbury, Shropshire that made steam-powered lorries, railway locomotives, and later, diesel engined lorries and locomotives.-Alley & MacLellan, Sentinel Works, Jessie Street Glasgow:...
for the London and North Eastern Railway
London and North Eastern Railway
The London and North Eastern Railway was the second-largest of the "Big Four" railway companies created by the Railways Act 1921 in Britain...
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 They passed into British Railways ownership in 1948 and were numbered 68130-68153 but 68134 was withdrawn almost immediately and may not have carried its BR number.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 superheatedSuperheater
A superheater is a device used to convert saturated steam or wet steam into dry steam used for power generation or processes. There are three types of superheaters namely: radiant, convection, and separately fired...
vertical water-tube boiler
Sentinel boiler
The Sentinel boiler was a design of vertical boiler, fitted to the numerous steam waggons built by the Sentinel Waggon Works.The boiler was carefully designed for use in a steam wagon: it was compact, easy to handle whilst driving, and its maintenance features recognised the problems of poor...
and the engine
Steam engine
A steam engine is a heat engine that performs mechanical work using steam as its working fluid.Steam engines are external combustion engines, where the working fluid is separate from the combustion products. Non-combustion heat sources such as solar power, nuclear power or geothermal energy may be...
were similar to those used in Sentinel steam wagon
Steam wagon
A steam wagon is a steam-powered road vehicle for carrying freight. It was the earliest form of lorry and came in two basic forms: overtype and undertype – the distinction being the position of the engine relative to the boiler...
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
Poppet valve
A poppet valve is a valve consisting of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem. The shaft guides the plug portion by sliding through a valve guide...
s and reversing was by sliding camshaft
Camshaft
A camshaft is a shaft to which a cam is fastened or of which a cam forms an integral part.-History:An early cam was built into Hellenistic water-driven automata from the 3rd century BC. The camshaft was later described in Iraq by Al-Jazari in 1206. He employed it as part of his automata,...
. The advantage of the water-tube boiler was that steam could be raised much more quickly than with a conventional fire-tube boiler
Fire-tube boiler
A fire-tube boiler is a type of boiler in which hot gases from a fire pass through one or more tubes running through a sealed container of water...
.
Transmission
Final drive to the wheels was by sprocket chainSprocket
A sprocket or sprocket-wheel is a profiled wheel with teeth, cogs, or even sprockets that mesh with a chain, track or other perforated or indented material. The name 'sprocket' applies generally to any wheel upon which are radial projections that engage a chain passing over it...
. 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.