Data from T Hurry Riches and Sidney B Haslam, "Steam Motor-Car Traffic", Proceedings of the Institution of Mechanical Engineers, 1906, Parts 3-4 (October 1906), pp. 658-659, 664-666.
This was the largest steam motor coach to be built for British service and was designed by the Port Talbot's Locomotive Superintendent, A H Hertz. Riches and Haslam noted the 6-coupled adhesive footprint and the 3-ft drivers and comment that the grade out of Port Talbot was "...extremely steep." -- a 3-mile stretch of 2 1/2% grade (1 in 40 ft). The rest of the 14-mile run to Pontyrhill had ruling grades of 1%, which of course the steam motor coach would have to scale in the other direction. At the half-yearly meeting in 1906, Port Talbot's Colonel J R Wright claimed that the new steam rail motor coach had already given "satisfaction." It would "undoubtedly" lead to economy. NB: Tube length is an estimate based on the calculation of tube surface area by subtracting reported firebox heating surface from reported total evaporative heating surface
Principal Dimensions by Steve Llanso of Sweat House Media | |
|---|---|
| Class | Steam motor coach |
| Locobase ID | 12312 |
| Railroad | Port Talbot Railway & Docks |
| Country | Great Britain |
| Whyte | 0-6-0T+4 |
| Number in Class | 1 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 1 |
| Builder | R W Hawthorne |
| Year | 1907 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9.50 / 2.90 |
| Engine Wheelbase (ft / m) | 9.50 / 2.90 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 50 / 15.24 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | |
| Engine Weight (lbs / kg) | |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 600 / 2.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 36 / 914 |
| Boiler Pressure (psi / kPa) | 170 / 11.70 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 |
| Tractive Effort (lbs / kg) | 9248 / 4194.83 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 69 / 6.41 |
| Grate Area (sq ft / m2) | 13.10 / 1.22 |
| Evaporative Heating Surface (sq ft / m2) | 660 / 61.34 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 660 / 61.34 |
| Evaporative Heating Surface/Cylinder Volume | 315.13 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2227 |
| Same as above plus superheater percentage | 2227 |
| Same as above but substitute firebox area for grate area | 11,730 |
| Power L1 | 4894 |
| Power MT | |