Caledonian Railway 72 Class

Caledonian Railway 72 Class

300px '72' class No. 14493 at Inverness Depot in 1948

Type and origin Power type Steam Designer William Pickersgill Builder St. Rollox Works (10) Armstrong Whitworth (10) North British Locomotive Co. (12) Build date 1920 Total produced 32

Specifications Configuration 4-4-0 Gauge 4 ft 8 1⁄2 in (1,435 mm) standard gauge Driver diameter 6 ft 6 in (1,981 mm) Loco weight 61.25 long tons (62.23 t; 68.60 short tons) Boiler pressure 180 psi (1.24 MPa) Superheater Superheated Cylinders Two, inside Cylinder size 20.5 in × 26 in (521 mm × 660 mm) Valve gear Stephenson Valve type Piston valves

Performance figures Tractive effort 21,435 lbf (95.35 kN)

Career Operators CR • LMS Class CR: 72 Power class LMS: 3P

File:Polmadie Locomotive Depot geograph-2748350-by-Ben-Brooksbank.jpg

Caledonian '113' class 4-4-0 no. 14468 at Polmadie Locomotive Depot, 1948

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.

Numbering

Year	Quantity	Manufacturer	Class	CR nos.	LMS nos.	BR nos.
1916	6	St. Rollox Works	113	113–116, 121, 124	14461–14466	54461–54466
1916	10	North British Locomotive Co. 21442–21451	113	928–937	14467–14476	54467–54476
1920	10	St. Rollox Works	72	72–81	14477–14486	54477–54486
1921	10	Armstrong Whitworth 111–120	72	82–91	14487–14496	54487–54496
1922	12	North British Locomotive Co. 22943–22954	72	66–71, 92–97	14497–14508	54497–54508

The two classes together totalled 48 locomotives. These were withdrawn between 1953 and 1963.

Dimensions

Figures given in this section are from BR Database. Figures given by Rail UK are slightly different.

72 Class

See box, top right.

113 Class

See table below.

Introduced: 1916 
Total produced: 16
Locomotive weight: 61.25 long tons (62.23 t)
Boiler pressure: 175 psi (1.21 MPa)
Superheater: Yes
Cylinders: 20 in × 26 in (508 mm × 660 mm)
Driving wheel diameter: 6 ft 6 in (1,981 mm)
Valve gear: Stephenson
LMS/BR Power classification: 3P
Tractive effort: 19,833 lbf (88.22 kN)

Preservation

Although no members of the class have been preserved, there are plans to construct a replica.

See also

• Locomotives of the Caledonian Railway
• Locomotives of the London, Midland and Scottish Railway