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 Middle Run Media | |
---|---|
Class | X |
Locobase ID | 10726 |
Railroad | Highland |
Country | Great Britain |
Whyte | 0-6-4T |
Number in Class | 8 |
Road Numbers | 66-69, 29, 31, 42, 44 |
Gauge | Std |
Number Built | 8 |
Builder | North British |
Year | 1909 |
Valve Gear | Stephenson |
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) | |
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 / 1240 |
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 Volume | 156.76 |
Computations Relating to Power Output (More Information) | |
Robert LeMassena's Power Computation | 4037 |
Same as above plus superheater percentage | 4037 |
Same as above but substitute firebox area for grate area | 21,600 |
Power L1 | 4157 |
Power MT | 371.94 |