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R CLASS – TECHNICAL DATA

Group Numbers R700 to R769
Wheel arrangement 4-6-4 “Hudson”
Nominal coupled wheel diameter 6 feet 015/16 inches (1853 mm)
Overall length engine and tender 77 feet 3¼ inches (23.55 m)
Wheelbase Rigid Engine and tender 12 feet 10 inches (3.91 m) 67 feet (20.42 m)
Weight in working order Engine Tender Total 107 tons 12 cwt (109.3 tonne) 79 tons 16 cwt (81.1 tonne) 187 tons 8 cwt (190.4 tonne)
Adhesive weight 58 tons 10 cwt (59.4 tonne)
Maximum axle load 19 tons 10 cwt (19.8 tonne)
Boiler heating surface area Flues and tubes Firebox Superheater Total 1,958 sq. feet (181.9 m2) 285 sq. feet (26.5 m2) 462 sq. feet (42.9 m2) 2,705 sq. feet (251.3 m2)
Grate area 42 sq. feet (3.9 m2)
Working boiler pressure 210 psi (1,450 kPa)
Cylinder (2) diameter and stroke 21½ inches x 28 inches (546 mm x 711 mm)
Tractive effort at 85% boiler pressure 32,080 lbf ( 143 kN)
Maximum permissible speed 70 mph (112 km/h)
Tender capacity Water Coal 9,000 gallons (40,900 l) 6 tons (6.1 tonne)
Mechanical stoker Standard Stoker MB-1
Built by North British Locomotive Company, Glasgow, Scotland, in 1951 -1952

Last Updated: 13 November 2008

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