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