BR Standard Class 6 information

Specifications
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 4 in (1,016 mm)
Driver dia.	6 ft 2 in (1,880 mm)
Trailing dia.	3 ft 3+1⁄2 in (1,003 mm)
Length	68 ft 9 in (20.96 m)
Width	8 ft 8+3⁄4 in (2.66 m)
Height	13 ft 0+1⁄2 in (3.98 m)
Axle load	19 long tons (19 t; 21 short tons)
Adhesive weight	56.9 long tons (57.8 t; 63.7 short tons)
Loco weight	88.5 long tons (89.9 t; 99.1 short tons)
Tender weight	49.15 long tons (49.94 t; 55.05 short tons)
Tender type	BR1
Fuel type	Coal
Fuel capacity	7 long tons (7.1 t; 7.8 short tons)
Water cap.	4,250 imp gal (19,300 L; 5,100 US gal)
Firebox:
• Grate area	36 sq ft (3.3 m2)
Boiler	BR1
Boiler pressure	225 psi (1,550 kPa)
Heating surface:
• Firebox	195 sq ft (18.1 m2)
• Tubes and flues	1,878 sq ft (174.5 m2)
Superheater:;
• Heating area	592 sq ft (55.0 m2)
Cylinders	Two, outside
Cylinder size	19.5 in × 28 in (495 mm × 711 mm)

Type and origin
Type and origin
Power type	Steam
Designer	Robert Riddles at BR Derby
Builder	BR Crewe Works
Build date	December 1951 – March 1952
Total produced	10

BR Standard Class 6^[1]
BR Standard Class 6
	72001 Clan Cameron
Power type
Type and origin
Power type	Steam
Designer	Robert Riddles at BR Derby
Builder	BR Crewe Works
Build date	December 1951 – March 1952
Total produced	10
Configuration:;
Specifications
Configuration:;
• Whyte	4-6-2
• UIC	2′C1′ h2
Gauge	4 ft 8+1⁄2 in (1,435 mm) standard gauge
Leading dia.	3 ft 4 in (1,016 mm)
Driver dia.	6 ft 2 in (1,880 mm)
Trailing dia.	3 ft 3+1⁄2 in (1,003 mm)
Length	68 ft 9 in (20.96 m)
Width	8 ft 8+3⁄4 in (2.66 m)
Height	13 ft 0+1⁄2 in (3.98 m)
Axle load	19 long tons (19 t; 21 short tons)
Adhesive weight	56.9 long tons (57.8 t; 63.7 short tons)
Loco weight	88.5 long tons (89.9 t; 99.1 short tons)
Tender weight	49.15 long tons (49.94 t; 55.05 short tons)
Tender type	BR1
Fuel type	Coal
Fuel capacity	7 long tons (7.1 t; 7.8 short tons)
Water cap.	4,250 imp gal (19,300 L; 5,100 US gal)
Firebox:
• Grate area	36 sq ft (3.3 m2)
Boiler	BR1
Boiler pressure	225 psi (1,550 kPa)
Heating surface:
• Firebox	195 sq ft (18.1 m2)
• Tubes and flues	1,878 sq ft (174.5 m2)
Superheater:;
• Heating area	592 sq ft (55.0 m2)
Cylinders	Two, outside
Cylinder size	19.5 in × 28 in (495 mm × 711 mm)
Tractive effort
Performance figures
Tractive effort	27,520 lbf (122.4 kN)
Factor of adh.	4.63
Operators
Career
Operators	British Railways
Power class	6P5F
Numbers	72000–72009
Axle load class	Route Availability 8
Locale	Scottish Region, London Midland Region
Withdrawn	December 1962 – June 1966
Disposition	All original locomotives scrapped, 72010 Hengist under construction.

The BR Standard Class 6, otherwise known as the Clan Class, was a class of 4-6-2 Pacific tender steam locomotive designed by Robert Riddles for use by British Railways. Ten locomotives were constructed between 1951 and 1952, with a further 15 planned for construction. However, due to acute steel shortages in Britain, the order was continually postponed until it was finally cancelled on the publication of the 1955 Modernisation Plan for the re-equipment of British Railways. All of the original locomotives were scrapped, but a new one is being built.

The Clan Class was based upon the BR Standard Class 7 Britannia Class design, incorporating a smaller boiler and various weight-saving measures to increase the route availability of a Pacific-type locomotive for its intended area of operations, the west of Scotland. The Clan Class received a mixed reception from crews, with those regularly operating the locomotives giving favourable reports as regards performance.^[2] However, trials in other areas of the British Railways network returned negative feedback, a common complaint being that difficulty in steaming the locomotive made it hard to adhere to timetables. Reports exist that suggest a degree of the disappointment with these locomotives was attributable to their being allocated to Class 7 work where they were only a Class 6 in reality; a problem put down to their very similar appearance to the BR Standard Class 7.

Some of the Clan Class locomotives took their names from the Highland Railway Clan Class which was being withdrawn from service at the time, indicating further their intended area of operations.^[3] The class was ultimately deemed a failure by British Railways, and the last was withdrawn in 1966. None survived into preservation, although a project to build the next locomotive in line, number 72010 Hengist, is progressing. Assembly of the frames has commenced at CTL Seal, Sheffield.

^ Clarke, David: Riddles Class 6/7 Standard Pacifics, pp.80–87
^ Atkins 1992, p. 10.
^ Cite error: The named reference Cox1 was invoked but never defined (see the help page).

[Clarke-1] Clarke, David: Riddles Class 6/7 Standard Pacifics, pp.80–87

[FOOTNOTEAtkins199210-2] Atkins 1992, p. 10.

[Cox1-3] Cite error: The named reference Cox1 was invoked but never defined (see the help page).

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