Data from Marsden, LNER Encyclopedia, [] (last accessed 31 January 2009) and George Frederick Bird, The Locomotives of the Great Northern Railway 1847-1910 (London: Locomotive Publishing Company, 1910), p. 201-203. Doncaster's works numbers 1107-1108.
The concept of a steam rail motor mated a small locomotive to a single railway carriagein a single frame; the two parts - motor and coach - were detachable, however The carriage had a seating capacity of 53 passengers in a single vehicle subdivided front to back into sections for luggage, 3rd-class smoking and non-smoking, 1st class saloon, and the guard's compartment, which had controls to allow the vehicle to travel coach first.
Kitsons and Avonside supplied pairs of motor coaches as well; see Locobases 9927 and 9928.
According to Marsden, even though the GNR envisioned a wide network of such rail motors, "they were only used between Louth & Grimsby (14 miles), Hitchin & Baldock, Finchley & Edgware, and on the Chickenley Heath branch (Ossett to Batley)."
By August 1914, he adds, they were restricted to duties between Louth & Grimsby, Hitchin & Baldock, and on Sundays Hitchin & Hatfield." Ironically, the concept might have proved too inflexible - the locomotive would have had trouble pulling more than one coach, and the set couldn't really be used for any other service. By 1917, all 6 had been taken out of service. The coach portions were later converted into twin composite brake carriages and and numbered 44151-44152 by the LNER.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 1 |
| Locobase ID | 9926 |
| Railroad | Great Northern |
| Country | Great Britain |
| Whyte | 0-4-0+4T |
| Number in Class | 2 |
| Road Numbers | 1-2 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Doncaster |
| Year | 1905 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | 52.42 / 15.98 |
| 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) | |
| 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) | 175 / 1210 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 10" x 16" / 254x406 |
| Tractive Effort (lbs / kg) | 5409 / 2453.48 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 178 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 4 / 1.22 |
| Firebox Area (sq ft / m2) | 56 / 5.20 |
| Grate Area (sq ft / m2) | 9.50 / 0.88 |
| Evaporative Heating Surface (sq ft / m2) | 382 / 35.49 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 382 / 35.49 |
| Evaporative Heating Surface/Cylinder Volume | 262.64 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1663 |
| Same as above plus superheater percentage | 1663 |
| Same as above but substitute firebox area for grate area | 9800 |
| Power L1 | 5841 |
| Power MT | |