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LNER Class A4 4488 Union of South Africa
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Picture of LNER Class A4 4488 Union of South Africa

Technical Details
Cylinders (x3): 18.5x26in.
Motion: Outside: Walschaerts
Inside: Gresley
Piston Valves: 9in. diameter
Boiler: Max. Diameter: 6ft 5in
Pressure: 250psi
Heating Surface: Total: 3325.2 sq.ft.
Firebox: 231.2 sq.ft.
Superheater: 748.9 sq.ft.
Tubes: 1281.4 sq.ft. (121x 2.25in)
Flues: 1063.7 sq.ft. (43x 5.25in)
Grate Area: 41.25 sq.ft.
Wheels: Leading: 3ft 2in
Coupled: 6ft 8in
Trailing: 3ft 8in
Tender: 4ft 2in
Tractive Effort: 35,455lb (@ 85% boiler pressure)
Total Wheelbase: 60ft 10.625in
Engine Weight: 102 tons 19cwt (full)
Max. Axle Load: 22 tons
 
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