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Page views since 2023-01-26: 436202

South Africa | 1953 | 120 produced

GMAM No. 4079 in September 2006 at Capital Park, Pretoria

GMAM No. 4079 in September 2006 at Capital Park, Pretoria

Col André Kritzinger CC BY-SA: Attribution-ShareAlike

flickr/Historical Railway Images Public Domain

Variant	GMA	GMAM

General
Built	1953-1958
Manufacturer	Henschel, Beyer, Peacock & Co., North British
Axle config	4-8-2+2-8-4T (Double Mountain (Garratt))
Gauge	3 ft 6 in (Cape gauge)

Dimensions and Weights
Length	93 ft 10 in
Wheelbase	30 ft 4 in
Rigid wheelbase	14 ft 5 in
Total wheelbase	86 ft 4 in
Service weight	419,000 lbs	428,800 lbs
Adhesive weight	268,750 lbs	273,600 lbs
Axle load	34,400 lbs	35,165 lbs
Water capacity	10,136 us gal	10,676 us gal
Fuel capacity	25,984 lbs (coal)	31,360 lbs (coal)

Boiler
Grate area	63.2 sq ft
Firebox area	237.2 sq ft
Tube heating area	2,973.8 sq ft
Evaporative heating area	3,211 sq ft
Superheater area	747 sq ft
Total heating area	3,958 sq ft

Variant	GMA	GMAM

Power Plant
Driver diameter	54 in
Boiler pressure	200 psi
Expansion type	simple
Cylinders	four, 20 1/2 x 26 in

Power
Power source	steam
Estimated power	2,175 hp (1,622 kW)
Optimal speed	20 mph
Starting effort	68,796 lbf

Calculated Values
Factor of adhesion	1 : 3.91	1 : 3.98
Power-to-weight ratio	0.0052 hp/lb	0.0051 hp/lb
Heating Area Equivalent	5,891.2 sq ft
Cylinder volume/HAE	1 : 1027.78
Adhesive weight/Total	1 : 1.56	1 : 1.57
Tractive force/Heating area	1 : 3907.51
Grate area/Heating area	1 : 58.89
Firebox/Tube area	1 : 15.68
Total/Superheater	1 : 4.30

steam locomotive

passenger

freight

Garratt

last changed: 03 2024

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