Data from "Latest Rail Motor Coaches", The Locomotive Magazine, (15 March 1905), p. 47; and "Steam Railway Motor Cars with Detachable Engines", Engineering News, Volume LIII [53], No 18 (4 May 1905), p. 463. See also 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. 660-661, 675.
According to the LM article, these 46-passenger carriages were introduced in the Stoke-on-Trent district to compete with the burgeoning electric tramway service. They were to stop to pick up riders at level crossings, bridges and the like to drop workers off at any one of the several collieries between Silverdale and Trentham.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Steam motor |
| Locobase ID | 12313 |
| Railroad | North Staffordshire |
| Country | Great Britain |
| Whyte | 0-2-2+4T |
| Number in Class | 2 |
| Road Numbers | |
| Gauge | Std |
| Number Built | 2 |
| Builder | Beyer, Peacock |
| Year | 1905 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8 / 2.44 |
| Engine Wheelbase (ft / m) | 8 / 2.44 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 44.83 / 13.66 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 46,760 / 21,210 |
| Engine Weight (lbs / kg) | 72,716 / 32,983 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 450 / 1.70 |
| 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) | 44 / 1118 |
| Boiler Pressure (psi / kPa) | 180 / 1240 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 8.5" x 14" / 216x356 |
| Tractive Effort (lbs / kg) | 3517 / 1595.29 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 13.30 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 242 - 1.375" / 35 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 41.60 / 3.86 |
| Grate Area (sq ft / m2) | 7 / 0.65 |
| Evaporative Heating Surface (sq ft / m2) | 368 / 34.19 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 368 / 34.19 |
| Evaporative Heating Surface/Cylinder Volume | 400.23 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1260 |
| Same as above plus superheater percentage | 1260 |
| Same as above but substitute firebox area for grate area | 7488 |
| Power L1 | 8269 |
| Power MT | |