loco-info.com - Great Western Railway class 157

Dimensions and Weights
Total wheelbase	16 ft
Service weight	66,572 lbs	80,976 lbs
Adhesive weight	28,678 lbs	36,960 lbs
Axle load	28,678 lbs	36,960 lbs
Fuel capacity	coal

Boiler
Grate area	14.6 sq ft	19.3 sq ft
Firebox area		115 sq ft
Tube heating area		1,099.3 sq ft
Evaporative heating area	1,240.8 sq ft	1,214.3 sq ft
Total heating area	1,240.8 sq ft	1,214.3 sq ft

Variant	as built	Dean 1878

Power Plant
Driver diameter	84 in
Boiler pressure	130 psi	140 psi
Expansion type	simple
Cylinders	two, 16 x 24 in	two, 18 x 24 in

Power
Power source	steam
Estimated power	300 hp (224 kW)	450 hp (336 kW)
Optimal speed	24 mph	26 mph
Starting effort	8,082 lbf	11,016 lbf

Calculated Values
Factor of adhesion	1 : 3.55	1 : 3.36
Power-to-weight ratio	0.0045 hp/lb	0.0056 hp/lb
Heating Area Equivalent		1,789.3 sq ft
Cylinder volume/HAE		1 : 951.40
Adhesive weight/Total	1 : 2.32	1 : 2.19
Tractive force/Heating area	1 : 1464.30	1 : 2039.50
Grate area/Heating area		1 : 56.96
Firebox/Tube area		1 : 9.56

steam locomotive

express

last changed: 10 2023

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