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Highland Railway class L “Skye Bogies”
London, Midland & Scottish class 1P
Great Britain | 1882 | 5 produced
Locomotive Magazine, November 1901

The Highland Railway had taken over the Dingwall and Skye Railway in 1880, which traversed the northern part of the Scottish Highlands from east to west. Although it was not until 1897 that the last ten miles were extended to Kyle of Lochalsh, ending opposite the Isle of Skye, the route was not easy to negotiate. There were many inclines up to 1 in 50 and curves with a radius of 1.300 feet or less.

David Jones' Duke class, later known as the class F, did reasonably well on the track. However, since the 75.5-inch coupled wheels were too large and the speed dropped too sharply on the inclines, locomotive number 70 was built in 1882 with 63-inch wheels. Like the class F, it had an outside frame, slightly sloping cylinders with the same dimensions and also the same valve gear. In addition to the downsized wheels, boiler pressure has been increased by ten psi to further increase pulling power. Now the number 70 could be used in front of both passenger and freight trains.

It was not until 1892 that Jones had four more pieces built and his successor Peter Drummond procured four more until 1901. The nine examples formed the only class on the Highland Railway to be built entirely in their own workshops at Lochgorm, Inverness. They were classified by the LMS in power class 1P, but were completely phased out and scrapped between 1922 and 1930.

Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length58 ft 7 in
Wheelbase21 ft 6 in
Fixed wheelbase8 ft 9 in
Service weight96,320 lbs
Adhesive weight62,720 lbs
Total weight163,520 lbs
Axle load31,360 lbs
Water capacity3,026 us gal
Fuel capacitycoal
Power sourcesteam
Estimated power550 hp (410 kW)
Optimal speed22 mph
Starting effort15,737 lbf
Power Plant
Driver diameter63 in
Boiler pressure150 psi
Expansion typesimple
Cylinderstwo, 18 x 24 in
Grate area16.2 sq ft
Firebox area93 sq ft
Tube heating area1,123 sq ft
Evaporative heating area1,216 sq ft
Total heating area1,216 sq ft
Calculated Values
steam locomotive
David Jones
last changed: 09/2022

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