loco-info.com - London & North Western class A

Between 1893 and 1900, Francis Webb built 111 class A 0-8-0 goods locomotives for the LNWR. Like earlier Webb compounds with two driving axles they had two small high-pressure cylinders on the outside and one larger low-pressure cylinder on the inside. But unlike these, all four axles of the class A were coupled.

Since Webb's successors Whale and Bowen Cooke wanted to clear the problems of the Webb compounds, they rebuilt the whole class into two-cylinder simple locomotives. So 15 became class C, 62 became class D and 34 became class C1. Most were again rebuilt to class G1 and some of these again to class G2a, with the last ones only being withdrawn in 1962.

General
Built	1893-1900
Manufacturer	Crewe
Wheel arr.	0-8-0 (Eight-coupled)
Gauge	4 ft 8 1/2 in (Standard gauge)

Dimensions and Weights
Wheelbase	17 ft 3 in
Rigid wheelbase	17 ft 3 in
Service weight	112,000 lbs
Adhesive weight	112,000 lbs
Axle load	32,256 lbs
Fuel capacity	coal

Boiler
Grate area	20.5 sq ft
Firebox area	115 sq ft
Tube heating area	1,490 sq ft
Evaporative heating area	1,605 sq ft
Total heating area	1,605 sq ft

Power Plant
Driver diameter	53 in
Boiler pressure	175 psi
Expansion type	compound
Cylinders	three, HP: 15 x 24 in and LP: 30 x 24 in

Power
Power source	steam
Estimated power	700 hp (522 kW)
Starting effort	20,208 lbf
with start valve	24,250 lbf

Calculated Values
Factor of adhesion	1 : 4.62
Optimal speed	22 mph
Power-to-weight ratio	0.0063 hp/lb
Heating Area Equivalent	2,180 sq ft
Cylinder volume/HAE	1 : 1715.80
Adhesive weight/Total	1 : 1.00
Tractive force/Heating area	1 : 3396.58
Grate area/Heating area	1 : 72.66
Firebox/Tube area	1 : 12.96
HP/LP cylinders	1 : 8.00

steam locomotive

freight

Francis William Webb

Webb compound

last changed: 07/2024

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