loco-info.com - Central South African class 10-2

Class 10BR No. 751, a former 10A, in September 1962

Leith Paxton CC BY-SA: Attribution-ShareAlike

The CSAR class 10-2 was made up of Pacific tender locomotives which were primarily based on the class 10. In 1910, five locomotives were built without and five with a Schmidt superheater. The result was that the superheated locomotives could haul about 25 percent more. In 1911 five more were built with superheaters and in 1912 the SAR classified the two variants as class 10A and 10B. In the thirties a total of ten were fitted with the standard boiler No. 1 by A.G. Watson and renamed class 10BR. They remained in service until 1974.

Variant	10A	10B	rebuilt 10BR

General
Built	1910	1910-1911
Manufacturer	North British	North British, Beyer, Peacock & Co.
Wheel arr.	4-6-2 (Pacific)
Gauge	3 ft 6 in (Cape gauge)

Dimensions and Weights
Length	63 ft 10 3/4 in
Wheelbase	30 ft 2 in
Rigid wheelbase	10 ft 10 in
Total wheelbase	55 ft 8 in
Service weight	165,200 lbs	166,768 lbs	170,464 lbs
Adhesive weight	105,280 lbs		107,856 lbs
Total weight	275,744 lbs	277,312 lbs	281,008 lbs
Axle load	35,616 lbs	35,168 lbs	36,736 lbs
Water capacity	4,804 us gal
Fuel capacity	22,400 lbs (coal)

Boiler
Grate area	34.6 sq ft	35 sq ft	36 sq ft
Firebox area	128 sq ft	125 sq ft	123 sq ft
Tube heating area	1,682 sq ft	1,463 sq ft	1,497 sq ft
Evaporative heating area	1,810 sq ft	1,588 sq ft	1,620 sq ft
Superheater area		384 sq ft	366 sq ft
Total heating area	1,810 sq ft	1,972 sq ft	1,986 sq ft

Variant	10A	10B	rebuilt 10BR

Power Plant
Driver diameter	62 in
Boiler pressure	200 psi	180 psi
Expansion type	simple
Cylinders	two, 18 1/2 x 28 in	two, 20 x 28 in

Power
Power source	steam
Estimated power	950 hp (708 kW)	1,100 hp (820 kW)
Starting effort	26,276 lbf	27,639 lbf

Calculated Values
Factor of adhesion	1 : 4.01	1 : 3.81	1 : 3.90
Optimal speed	23 mph	25 mph
Power-to-weight ratio	0.0057 hp/lb	0.0066 hp/lb	0.0065 hp/lb
Heating Area Equivalent	2,450 sq ft	2,981 sq ft	2,967 sq ft
Cylinder volume/HAE	1 : 1083.73	1 : 890.69	1 : 894.90
Adhesive weight/Total	1 : 1.57	1 : 1.58
Tractive force/Heating area	1 : 3263.57	1 : 3150.86	1 : 3128.64
Grate area/Heating area	1 : 48.62	1 : 52.77	1 : 51.74
Firebox/Tube area	1 : 13.14	1 : 14.78	1 : 15.15
Total/Superheater		1 : 4.14	1 : 4.43

steam locomotive

express

passenger

G.G. Elliot

last changed: 04/2023

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