Caledonian Railway 72 Class

Specifications
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 6 in (1.067 m)
Driver dia.	6 ft 6 in (1,981 mm)
Wheelbase	46 ft 10+3⁄4 in (14.29 m)
Length	56 ft 4+1⁄2 in (17.18 m)
Height	12 ft 10+1⁄2 in (3,924 mm)
Axle load	19 long tons 18 cwt (44,600 lb or 20.2 t)
Adhesive weight	39 long tons 15 cwt (89,000 lb or 40.4 t)
Loco weight	61 long tons 5 cwt (137,200 lb or 62.2 t)
Tender weight	46 long tons 10 cwt (104,200 lb or 47.2 t)
Total weight	107 long tons 15 cwt (241,400 lb or 109.5 t)
Fuel type	Coal
Fuel capacity	6 long tons 12 cwt (14,800 lb or 6.7 t)
Water cap.	4,200 imp gal (19,000 L; 5,000 US gal)
Firebox:
• Grate area	17 sq ft (1.6 m2)
Boiler pressure	180 psi (1.24 MPa)
Heating surface:
• Firebox	144 sq ft (13.4 m2)
• Total surface	1,529 sq ft (142.0 m2)
Superheater:;
• Heating area	200 sq ft (19 m2)
Cylinders	Two, inside
Cylinder size	20.5 in × 26 in (521 mm × 660 mm)
Valve gear	Stephenson
Valve type	Piston valves
Valve travel	9 in (229 mm)
Train brakes	Westinghouse air brake

Type and origin
Type and origin
Power type	Steam
Designer	William Pickersgill
Builder	St. Rollox Works (10); Armstrong Whitworth (10); North British Locomotive Co. (12)
Build date	May 1920 to December 1922
Total produced	32

Caledonian Railway 72 Class
Caledonian Railway 72 Class
	113 class No. 54471 at Dingwall in 1957
Power type
Type and origin
Power type	Steam
Designer	William Pickersgill
Builder	St. Rollox Works (10); Armstrong Whitworth (10); North British Locomotive Co. (12)
Build date	May 1920 to December 1922
Total produced	32
Configuration:;
Specifications
Configuration:;
• Whyte	4-4-0
• UIC	2′B h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 6 in (1.067 m)
Driver dia.	6 ft 6 in (1,981 mm)
Wheelbase	46 ft 10+3⁄4 in (14.29 m)
Length	56 ft 4+1⁄2 in (17.18 m)
Height	12 ft 10+1⁄2 in (3,924 mm)
Axle load	19 long tons 18 cwt (44,600 lb or 20.2 t)
Adhesive weight	39 long tons 15 cwt (89,000 lb or 40.4 t)
Loco weight	61 long tons 5 cwt (137,200 lb or 62.2 t)
Tender weight	46 long tons 10 cwt (104,200 lb or 47.2 t)
Total weight	107 long tons 15 cwt (241,400 lb or 109.5 t)
Fuel type	Coal
Fuel capacity	6 long tons 12 cwt (14,800 lb or 6.7 t)
Water cap.	4,200 imp gal (19,000 L; 5,000 US gal)
Firebox:
• Grate area	17 sq ft (1.6 m2)
Boiler pressure	180 psi (1.24 MPa)
Heating surface:
• Firebox	144 sq ft (13.4 m2)
• Total surface	1,529 sq ft (142.0 m2)
Superheater:;
• Heating area	200 sq ft (19 m2)
Cylinders	Two, inside
Cylinder size	20.5 in × 26 in (521 mm × 660 mm)
Valve gear	Stephenson
Valve type	Piston valves
Valve travel	9 in (229 mm)
Train brakes	Westinghouse air brake
Tractive effort
Performance figures
Tractive effort	21,435 lbf (95.35 kN)
Factor of adh.	4.15
Operators
Career
Operators	CR • LMS
Class	CR: 72
Power class	LMS: 3P
Number in class	32
Numbers	CR: 72-91, 66-71, 92-97; LMS: 14477-14508; BR: 54477-54508
Nicknames	"Pickersgill Bogies"
First run	May 1920
Last run	October 1, 1962
Withdrawn	1953 (1), 1959-1962 (31)
Disposition	All scrapped, replica planned

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.