Project 62 – Technical Information

USA Class 62 0-6-0T Steam Locomotives 30075 (formerly 62-669) and 62-521 (to become 30076)

Builder Djuro Djakovic Works, Slavonski Brod, Croatia
Designer Built to a "pattern" (licence HK Porter) of USATC "S100" 0-6-0T steam locomotive designed by Colonel Howard G Hill (USAR) in 1941 for War Department service in Europe, but utilising "plate" instead of "bar" frames. 106 of the original "S100" locomotives were taken into service after World War II to form Yugoslavian "Class 62". 90 further locomotives were built locally between 1952 and 1961 and added to "Class 62"
Year of Manufacture 1960 (62-669/30075); 1954 (62-521)
Works Number DD669/60; DD521/54
Service Numbers 62-669: Store Steelworks "Works Locomotive No 10" and 30075

62-521: Zenica Steelworks as 62-521

Acquired by Project 62 62-669 - 1990; 62-521 - 2006
Rebuilt 62-669 - 1992 at Herston Works (Swanage Railway), to UK Southern Railway "USA Class" dock tank specification and renumbered 30075. Currently undergoing heavy overhaul at Shillingstone in Dorset with the aim to return to traffic during 2019.

62-521 will be likewise rebuilt, hopefully into service by 2021

Length 29 ft 9 inches
Wheels 4 ft 6 inches diameter - arranged 0-6-0 with drive to rear (bunker end) wheels
Wheelbase 10 ft
Weight 46.5 tons (operational); 42 tons (dry weight)
Valve Gear Walschaerts
Cylinders 2 outside mounted - 16.5 inches diameter x 24 inches stroke
Boiler Pressure 200psi ("S100" - 210psi)
Water Tank Capacity 1,000 gals
Coal Bunker 30075: 1.5 tons; 62-521: 2.6 tonnes
Tractive Effort 20,570 lbs at 85% boiler pressure ("S100" - 21,600 lbs)
BR Power Classification 3F
Tractive Effort (TE) - the force in lbs applied to the rail by the locomotive wheels - is calculated using the following equation:-
TE = (c . P . (n/2) . d2 . s) / D
c = constant for effective boiler pressure and friction (usually 0.85)
P = boiler pressure in psi
n = number of pistons
d = piston diameter in inches
s = stroke length in inches
D = drive wheel diameter in inches
TE = (0.85 x 200 x (2/2) x 16.52 x 24) / 54 = 20,570 lbs (21,600 lbs original "S100" at 210 psi)
Contact us - for further information about 30075, 30076, joining Project 62 or comments about this website

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