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The reference for locomotives and railcars

Victorian Railways class R

Australia 1951 70 produced
R 710 on a works photo

The class R was only created after the Second World War as an express locomotive to replace the class A2 ten-wheelers. By installing a stoker, they wanted to ensure that it would perform well with coal of varying grades. The 70 locos arrived at the same time as some diesel and electric locos, giving them a very short career in service pulling express trains. They were then put into a wide variety of services, in which they performed well despite often poor maintenance. Today there are still six locomotives, four of which are still operational and partly had multiple operators. The R 766 was even converted to standard gauge. 

Technical data

General

Built
1951-1953
Manufacturers
North British
Wheel arrangement
4-6-4 (Hudson)
Gauge
1,600 mm (Irish broad gauge)

Dimensions and weights

Length
23.55 m
Wheelbase
11.05 m
Total wheelbase
20.42 m
Service mass
108.9 t
Adhesion mass
59.4 t
Total mass
189.8 t
Rigid wheelbase
3.91 m
Axle load
19.8 t
Water capacity
40,917 l
Fuel capacity
6.1 t (coal)

Boiler

Grate area
3.902 m²
Firebox surface
26.477 m²
Tube heating surface
181.904 m²
Evaporative heating surface
208.382 m²
Superheater surface
42.921 m²
Total heating surface
251.3 m²

Power plant

Driver diameter
1,854 mm
Boiler pressure
14.8 bar
Expansion type
simple expansion
Cylinders
two, 540 x 711 mm

Power

Power source
steam
Estimated power
1,641 kW (2,231 PS)
Starting effort
140.8 kN

Calculated values

Factor of adhesion
1 : 4.14
Optimal speed
71 km/h
Power-to-weight ratio
15.1 kW/t
Heating Surface Equivalent
426.6 m²
Cylinder volume/HSE
1 : 762.90
Adhesive weight/Total
1 : 1.83
Tractive force/Heating surface
1 : 11.70
Grate area/Heating surface
1 : 64.40
Firebox/Tube surface
1 : 6.87
Total/Superheater
1 : 4.86
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