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South Australian Railways 720 class information


South Australian Railways 720 Class
724 at North Adelaide station in 1952
Type and origin
Power typeSteam
DesignerFred Shea
BuilderIslington Railway Workshops
Build date1930-1943
Total produced17
Specifications
Configuration:
​
 • Whyte2-8-4 1′D2′ 3′3′
Gauge1,600 mm (5 ft 3 in)
Leading dia.2 ft 9 in (838 mm)
Driver dia.4 ft 9 in (1,448 mm)
Trailing dia.3 ft 0 in (914 mm)
3 ft 6 in (1,067 mm)
Length83 ft 6 in (25.45 m)
Height13 ft 11+5⁄8 in (4,256.1 mm)
Axle load19.85 long tons 0 cwt (44,500 lb or 20.2 t)
Adhesive weight77.10 long tons 0 cwt (172,700 lb or 78.3 t)
Loco weight123.80 long tons 0 cwt (277,300 lb or 125.8 t)
Tender weight104.00 long tons 0 cwt (233,000 lb or 105.7 t)
Total weight227 long tons 4 cwt (508,900 lb or 230.8 t)
Fuel typeCoal
Oil
Fuel capacity17 long tons 0 cwt (38,100 lb or 17.3 t)
3,060 imp gal
(3,670 US gal; 13,900 L) oil (locos converted to oil burning only)
Water cap.9,000 imp gal
(11,000 US gal; 41,000 L)
9,400 imp gal
(11,300 US gal; 43,000 L) (when oil fired)
Firebox:​
 • Grate area59.5 sq ft (5.53 m2)
Boiler pressure215 psi (1,482 kPa)
Heating surface:​
 • Firebox360 sq ft (33 m2)
 • Tubes2,615 sq ft (242.9 m2)
Superheater:
​
 • Heating area751 sq ft (69.8 m2)
Cylinders2
Cylinder size22 in × 28 in (559 mm × 711 mm)
Valve gearWalschaerts valve gear
Valve typePiston
Performance figures
Tractive effort43,450 lbf (193.28 kN)
52,000 lbf (231.31 kN) with booster engine cut in
Factor of adh.4.0
Career
OperatorsSouth Australian Railways
Class720
Number in class17
Numbers720-736
First run26/11/1930
Withdrawn1958-1960
Scrapped1958-1963
DispositionAll scrapped

The South Australian Railways 720 class was a class of 2-8-4 steam locomotives operated by the South Australian Railways.

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