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.
One of the biggest of the steam motor coaches, this passenger carriage had a steam-powered bogie in the front, a non-powered trailing bogie in the rear. The vertical boiler had a stack that extended only a few inches above the roof of the carriage.
A luggage compartment separated the passengers from the noise and heat of the boiler. First class held 16 passengers and its smoking section was at the luggage-compartment end. Third class seated 34 and had its smoking section at the rear. Both sections were lighted by electricity and heated by steam. A door centered in the side of the carriage afforded access to both classes.
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 Middle Run Media | |
|---|---|
| Class | Steam motor coach |
| Locobase ID | 12311 |
| Railroad | Great Central |
| Country | Great Britain |
| Whyte | 0-4-0T+4 |
| Number in Class | |
| Road Numbers | |
| Gauge | Std |
| Number Built | |
| Builder | Gorton |
| Year | 1904 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 9 / 3.05 |
| Engine Wheelbase (ft / m) | 9 / 3.05 |
| 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) | 66,640 / 30,227 |
| Engine Weight (lbs / kg) | 99,792 / 45,265 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 660 / 2.50 |
| 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) | 45 / 1143 |
| Boiler Pressure (psi / kPa) | 150 / 1030 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 12" x 16" / 305x406 |
| Tractive Effort (lbs / kg) | 6528 / 2961.05 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 10.21 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 450 - 1.25" / 32 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 3.83 / 1.17 |
| Firebox Area (sq ft / m2) | 52.36 / 4.87 |
| Grate Area (sq ft / m2) | 13 / 1.21 |
| Evaporative Heating Surface (sq ft / m2) | 610 / 56.69 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 610 / 56.69 |
| Evaporative Heating Surface/Cylinder Volume | 291.25 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1950 |
| Same as above plus superheater percentage | 1950 |
| Same as above but substitute firebox area for grate area | 7854 |
| Power L1 | 4683 |
| Power MT | |