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London & North Western Jubilee class
Great Britain | 1897 | 40 produced
Locomotive Magazine, May 1899

As a successor to the unconventional Teutonic class with a very large low-pressure cylinder and uncoupled driving axles, Francis William Webb developed the more conventional Jubilee class. The leading axle was replaced by a bogie and a total of four cylinders were installed. All cylinders now acted on the front driver axle and the rear one was coupled as usual.

When comparing the cylinder dimensions with other compound locomotives, it is noticeable that the piston area of the low-pressure cylinders was less than twice that of the high-pressure cylinders, while this ratio is ideally around 2.4. This meant that the high-pressure cylinders were already consuming a large part of the steam and the low-pressure cylinders were no longer being fully utilized. In addition, the volume of the cylinders was very large in relation to the boiler, which could lead to the boiler being exhausted more quickly.

Nevertheless, the 40 examples of this class were considered successful because they performed well in the hands of experienced drivers. Trains weighing almost 350 tons covered the hilly 157 miles non-stop from London to Crewe in three hours and four minutes, an average of 51 mph. Trains with up to 20 cars have also been reported.

General
Built1897-1900
ManufacturerCrewe
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase23 ft 2 in
Fixed wheelbase9 ft 8 in
Service weight122,070 lbs
Adhesive weight79,521 lbs
Total weight181,650 lbs
Axle load40,320 lbs
Fuel capacity11,200 lbs (coal)
Power
Power sourcesteam
Estimated power900 hp (671 kW)
Optimal speed41 mph
Starting effort14,068 lbf
with start valve16,882 lbf
Power Plant
Driver diameter85 in
Boiler pressure200 psi
Expansion typecompound
Cylindersfour, HP: 15 x 24 in
and LP: 20 1/2 x 24 in
Boiler
Grate area20.5 sq ft
Firebox area159 sq ft
Tube heating area1,379.5 sq ft
Evaporative heating area1,538.5 sq ft
Total heating area1,538.5 sq ft
Calculated Values
steam locomotive
express
Webb compound
Francis William Webb
last changed: 06/2022
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