Highland 0-6-4 Locomotives in Great_Britain

Class Details by Steve Llanso of Sweat House Media

Class X (Locobase 10726)

Data from "0-6-4 Tank Locomotive, Highland Ry", The Locomotive Magazine, Vol XV (14 September 1908), p. 154. See also [], last accessed 9 August 2009.

Peter Drummond, locomotive superintendent of the Highland, determined that the heights in the Blair Athol-Newtonmore section north of Perth needed more powerful banking ("helper") engines. So he designed this quartet, which was produced at Queen's Park Works. The later four which came in 1910-1912 (1, 1, and 2), entered service around the 1,328-ft summit at Slochd (near Inverness in Scotland's northeast), but Steamindex reports they were not well-suited to that duty.

They were not a great success, according to Wikipedia, for a number of reasons: "They were not popular with their crews, many thought them heavy and clumsy, and several crews had problems with water capacity." A detail-design error lent its own measure of irritation: "Their axleboxes were not well-proportioned either as there are reports of consistent hot box problems."

The LMS adopted the eight engines

Principal Dimensions by Steve Llanso of Sweat House Media

Locobase ID10726
CountryGreat Britain
Number in Class8
Road Numbers66-69, 29, 31, 42, 44
Number Built8
BuilderNorth British
Valve GearStephenson
Locomotive Length and Weight
Driver Wheelbase (ft / m)15.50 / 4.72
Engine Wheelbase (ft / m)27.75 / 8.46
Ratio of driving wheelbase to overall engine wheelbase 0.56
Overall Wheelbase (engine & tender) (ft / m)27.75 / 8.46
Axle Loading (Maximum Weight per Axle) (lbs / kg)37,296 / 16,917
Weight on Drivers (lbs / kg)73,920 / 33,530
Engine Weight (lbs / kg)109,760 / 49,786
Tender Loaded Weight (lbs / kg)
Total Engine and Tender Weight (lbs / kg)109,760 / 49,786
Tender Water Capacity (gals / ML)2400 / 9.09
Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) 4.40 / 4
Minimum weight of rail (calculated) (lb/yd / kg/m)41 / 20.50
Geometry Relating to Tractive Effort
Driver Diameter (in / mm)60 / 1524
Boiler Pressure (psi / kPa)180 / 12.40
High Pressure Cylinders (dia x stroke) (in / mm)18.5" x 26" / 470x660
Tractive Effort (lbs / kg)22,691 / 10292.48
Factor of Adhesion (Weight on Drivers/Tractive Effort) 3.26
Heating Ability
Tubes (number - dia) (in / mm)
Flues (number - dia) (in / mm)
Flue/Tube length (ft / m)
Firebox Area (sq ft / m2)120 / 11.15
Grate Area (sq ft / m2)22.43 / 2.08
Evaporative Heating Surface (sq ft / m2)1268 / 117.84
Superheating Surface (sq ft / m2)
Combined Heating Surface (sq ft / m2)1268 / 117.84
Evaporative Heating Surface/Cylinder Volume156.76
Computations Relating to Power Output (More Information)
Robert LeMassena's Power Computation4037
Same as above plus superheater percentage4037
Same as above but substitute firebox area for grate area21,600
Power L14157
Power MT371.94

All material Copyright © SteamLocomotive.com
Wes Barris