The LNER Class Y10 was a class of 0-4-0

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 1930. The LNER numbered them 8403 and 8404 but they were later re-numbered 8186 and 8187.

They both passed into British Railways ownership in 1948 but 8187 was withdrawn almost immediately. Number 8186 was allocated the BR number 68186, but never actually carried it, and was withdrawn in 1952.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

Superheater

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. Each locomotive had two 2-cylinder engines, giving a total of 200 horsepower. 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 chain

Sprocket

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...

. There was a two-speed gearbox

Transmission (mechanics)

A machine consists of a power source and a power transmission system, which provides controlled application of the power. Merriam-Webster defines transmission as: an assembly of parts including the speed-changing gears and the propeller shaft by which the power is transmitted from an engine to a...

 but gears could only be changed while the locomotive was stationary. Tractive effort was:

• Low gear 11435 lbf (50.9 kN)
• High gear 7965 lbf (35.4 kN)

Usage

These locomotives were intended for service on the Wisbech and Upwell Tramway

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, Cambridgeshire and Upwell, Norfolk to carry agricultural produce. Although called a tram, in many ways it more closely resembled a conventional railway...

 and had several tram engine

Tram engine

A tram engine is a locomotive specially built, or modified, to work on a street, or roadside, tramway.-Steam tram engines:In the steam locomotive era, tram engines had to comply with certain legal requirements, although these varied from country to country:* The engine must be governed to a maximum...

 features. These included cowcatchers

Pilot (locomotive)

In railroading, the pilot is the device mounted at the front of a locomotive to deflect obstacles from the track that might otherwise derail the train. In some countries it is also called cowcatcher or cattle catcher....

 and sideplates and a cab at each end.

They were not a great success on the Wisbech and Upwell and both were moved to Yarmouth

Great Yarmouth

Great Yarmouth, often known to locals as Yarmouth, is a coastal town in Norfolk, England. It is at the mouth of the River Yare, east of Norwich.It has been a seaside resort since 1760, and is the gateway from the Norfolk Broads to the sea...

in May 1931 to work the quayside line.