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Highland Railway class F “Duke”
Great Britain | 1874 | 17 produced
flickr/Historical Railway Images

David Jones had ten 4-4-0 express locomotives built by Dübs in 1874, which were first called the Bruce class and later renamed the Duke class when another class with that name was introduced. Between 1876 and 1888 the Highland Railway built seven more at their own Lochgorm workshops in Inverness.

The appearance of the locomotives was characterized by the outside frames in which the outside cylinders were arranged at an angle in the same way as, for example, Jones' later "Skye Bogies". The chimney was louvred at the front, which was intended to improve the draft in the boiler. The machines from Inverness had a slightly smaller boiler, which had a higher pressure of 150 instead of 140 psi

In the new class scheme that Drummond introduced in 1901, they became class F. The Dübs machines were the first to be retired from 1907 because they were the oldest. Five survived until 1923, but no longer received an LMS number.

General
Built1874, 1876-1888
ManufacturerDübs & Co., Lochgorm
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase21 ft 6 in
Fixed wheelbase8 ft 9 in
Total wheelbase51 ft 3 in
Service weight91,840 lbs
Adhesive weight59,500 lbs
Total weight159,040 lbs
Axle load31,920 lbs
Water capacity2,162 us gal
Fuel capacity8,960 lbs (coal)
Power
Power sourcesteam
Estimated power425 hp (317 kW)
Optimal speed22 mph
Starting effort12,256 lbf
Power Plant
Driver diameter75.5 in
Boiler pressure140 psi
Expansion typesimple
Cylinderstwo, 18 x 24 in
Boiler
Grate area16.3 sq ft
Firebox area98.8 sq ft
Tube heating area1,129.3 sq ft
Evaporative heating area1,228 sq ft
Total heating area1,228 sq ft
Calculated Values
steam locomotive
express
David Jones
last changed: 01/2024
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