| Caledonian Railway 72 Class | |
| Powertype: | Steam |
| Designer: | William Pickersgill |
| Builder: | St. Rollox Works (10) Armstrong Whitworth (10) North British Locomotive Co. (12) |
| Builddate: | May 1920 to December 1922 |
| Totalproduction: | 32 |
| Whytetype: | 4-4-0 |
| Uicclass: | 2′B h2 |
| Leadingdiameter: | 3feet |
| Driverdiameter: | 6feet |
| Wheelbase: | 46feet |
| Length: | 56feet |
| Height: | 12feet |
| Fueltype: | Coal |
| Watercap: | 4200impgal |
| Boilerpressure: | 1802NaN2 |
| Firearea: | 17square feet |
| Fireboxarea: | 144square feet |
| Totalsurface: | 1529square feet |
| Superheaterarea: | 200square feet |
| Cylindercount: | Two, inside |
| Cylindersize: | 20.5x |
| Valvegear: | Stephenson |
| Valvetype: | Piston valves |
| Valvetravel: | 90NaN0 |
| Tractiveeffort: | 21435lbf |
| Factorofadhesion: | 4.15 |
| Trainbrakes: | Westinghouse air brake |
| Operator: | CRLMS |
| Operatorclass: | CR: 72 |
| Powerclass: | LMS: 3P |
| Numinclass: | 32 |
| Fleetnumbers: | CR: 72-91, 66-71, 92-97 LMS: 14477-14508 BR: 54477-54508 |
| Nicknames: | "Pickersgill Bogies" |
| Firstrundate: | May 1920 |
| Lastrundate: | October 1, 1962 |
| Withdrawndate: | 1953 (1), 1959-1962 (31) |
| Disposition: | All scrapped |
The Caledonian Railway 72 Class was a class of 4-4-0 steam locomotives introduced by William Pickersgill for the Caledonian Railway (CR) in 1920. Thirty-two locomotives were built and all survived to be taken over by the London, Midland and Scottish Railway (LMS) in 1923 and by British Railways (BR) in 1948. The earlier 113 Class (introduced in 1916), of which 16 were produced, were similar but slightly smaller. These were the Caledonian's last express passenger locomotives, and technically, the last of the Dunalastair series, and were unofficially dubbed, Dunalastair V.
| Year | Quantity | Manufacturer | Class | CR nos. | LMS nos. | BR nos. | ||
|---|---|---|---|---|---|---|---|---|
| 1916 | 6 | style=text-align:left | St. Rollox Works | 113 | 113–116, 121, 124 | 14461–14466 | 54461–54466 | |
| 1916 | 10 | style=text-align:left | North British Locomotive Co. 21442–21451 | 113 | 928–937 | 14467–14476 | 54467–54476 | |
| 1920 | 10 | style=text-align:left | St. Rollox Works | 72 | 72–81 | 14477–14486 | 54477–54486 | |
| 1921 | 10 | style=text-align:left | Armstrong Whitworth 111–120 | 72 | 82–91 | 14487–14496 | 54487–54496 | |
| 1922 | 12 | style=text-align:left | North British Locomotive Co. 22943–22954 | 72 | 66–71, 92–97 | 14497–14508 | 54497–54508 |
The two classes together totalled 48 locomotives. No. 54481 was scrapped after an accident at Gollafield Junction in 1953, the remainder were withdrawn between 1959 and 1962.[1]
Figures given in this section are from BR Database. Figures given by Rail UK are slightly different.
See table below.[4] [5] Introduced: 1916 Total produced: 16 Locomotive weight: 61.25LT Boiler pressure: 1752NaN2 Superheater: Yes Cylinders: 20x Driving wheel diameter: 6feet Valve gear: Stephenson LMS/BR Power classification: 3P Tractive effort: 19833lbf
Although no members of the class have been preserved, there are plans to construct a replica.