Caledonian Railway 72 Class
Encyclopedia
Caledonian Railway
72 Class was a class of 4-4-0
steam locomotives introduced by William Pickersgill
in 1920. Thirty-two locomotives were built and all survived to be taken over by the LMS
in 1923 and by British Railways in 1948.
The earlier 113 and 918 Classes (introduced in 1916) were similar but slightly smaller.
113 and 918 Classes
113 and 918 Classes
Caledonian Railway
The Caledonian Railway was a major Scottish railway company. It was formed in the early 19th century and it was absorbed almost a century later into the London, Midland and Scottish Railway, in the 1923 railway grouping, by means of the Railways Act 1921...
72 Class was a class of 4-4-0
4-4-0
Under the Whyte notation for the classification of steam locomotives, 4-4-0 represents the wheel arrangement of four leading wheels on two axles , four powered and coupled driving wheels on two axles, and no trailing wheels...
steam locomotives introduced by William Pickersgill
William Pickersgill
William Pickersgill was born in Nantwich in 1861 and died in Bournemouth on 2 May 1928. He was Chief Mechanical Engineer of the Caledonian Railway from 1914 until Grouping in 1923...
in 1920. Thirty-two locomotives were built and all survived to be taken over by the LMS
London, Midland and Scottish Railway
The London Midland and Scottish Railway was a British railway company. It was formed on 1 January 1923 under the Railways Act of 1921, which required the grouping of over 120 separate railway companies into just four...
in 1923 and by British Railways in 1948.
The earlier 113 and 918 Classes (introduced in 1916) were similar but slightly smaller.
Numbering
72 Class- Caledonian Railway: 72–91, 66–71, 92–97
- LMS: 14477–14508
- British Railways: 54477–54508
113 and 918 Classes
- Caledonian Railway: 113–116, 121, 124, 928–937
- LMS: 14461–14476
- British Railways: 54461–54476
Preservation
None has survived to preservation. However there are plans to construct a replica of a CR 72 Class Steam Locomotive For Scottish Railway Preservation.Dimensions
72 Class- LMS/BR Power classification, 3P
- LocomotiveSteam locomotiveA steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
weight: 61 tons 5 cwt - BoilerFire-tube boilerA 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...
pressure, 180 psi - SuperheaterSuperheaterA 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...
, Yes - CylindersCylinder (engine)A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...
, 20½"x26" - Driving wheelDriving wheelOn a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons...
diameter, 6' 6" - Tractive effortTractive effortAs used in mechanical engineering, the term tractive force is the pulling or pushing force exerted by a vehicle on another vehicle or object. The term tractive effort is synonymous with tractive force, and is often used in railway engineering to describe the pulling or pushing capability of a...
, 21,435 lb - Valve gearValve gearThe valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle...
, Stephenson
113 and 918 Classes
- LMS/BR Power classification, 3P
- LocomotiveSteam locomotiveA steam locomotive is a railway locomotive that produces its power through a steam engine. These locomotives are fueled by burning some combustible material, usually coal, wood or oil, to produce steam in a boiler, which drives the steam engine...
weight: 61 tons 5 cwt - BoilerFire-tube boilerA 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...
pressure, 180 psi - SuperheaterSuperheaterA 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...
, Yes - CylindersCylinder (engine)A cylinder is the central working part of a reciprocating engine or pump, the space in which a piston travels. Multiple cylinders are commonly arranged side by side in a bank, or engine block, which is typically cast from aluminum or cast iron before receiving precision machine work...
, 20"x26" - Driving wheelDriving wheelOn a steam locomotive, a driving wheel is a powered wheel which is driven by the locomotive's pistons...
diameter, 6' 6" - Tractive effortTractive effortAs used in mechanical engineering, the term tractive force is the pulling or pushing force exerted by a vehicle on another vehicle or object. The term tractive effort is synonymous with tractive force, and is often used in railway engineering to describe the pulling or pushing capability of a...
, 20,400 lb - Valve gearValve gearThe valve gear of a steam engine is the mechanism that operates the inlet and exhaust valves to admit steam into the cylinder and allow exhaust steam to escape, respectively, at the correct points in the cycle...
, Stephenson