Data from "Twelve-Wheeled Double Bogie Tank Engine, Midland & South-Western Junction Railway," The Locomotive & Railway Carriage & Wagon Review, Vol III (July 1898), p. 100.
This pair of bogie tanks were considerably heavier than the freight engines that would join them in a year or so (Locobase 10156). LM suggested that, while of unusual design, they "should be well adapted to the working conditions of a railway, abouinding in curves, having few watering stations, and a traffic necessitating the engines running either end first."
Perhaps, but the 17 & 18 must not have recommended themselves to the GWR, because they didn't survive their amalgamation with the GWR's own tank engines for very long. 25 was scrapped in 1927 and 27, although rebuilt in 1925, was scrapped in 1929.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 17 |
| Locobase ID | 10097 |
| Railroad | Midland & South-Western Junction (MSWJ) |
| Country | Great Britain |
| Whyte | 4-4-4T |
| Number in Class | 2 |
| Road Numbers | 17-18 / 25, 27 |
| Gauge | Std |
| Number Built | 2 |
| Builder | Sharp, Stewart |
| Year | 1897 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 7.50 / 2.29 |
| Engine Wheelbase (ft / m) | 31.62 / 9.64 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.24 |
| Overall Wheelbase (engine & tender) (ft / m) | 31.62 / 9.64 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 32,704 / 14,834 |
| Weight on Drivers (lbs / kg) | 86,464 / 39,219 |
| Engine Weight (lbs / kg) | 132,720 / 60,201 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 132,720 / 60,201 |
| Tender Water Capacity (gals / ML) | 2280 / 8.64 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 72 / 36 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 63 / 1600 |
| Boiler Pressure (psi / kPa) | 140 / 970 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 17" x 24" / 432x610 |
| Tractive Effort (lbs / kg) | 13,101 / 5942.52 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.60 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 194 - 1.75" / 44 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 95 / 8.83 |
| Grate Area (sq ft / m2) | 17 / 1.58 |
| Evaporative Heating Surface (sq ft / m2) | 1050 / 97.58 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1050 / 97.58 |
| Evaporative Heating Surface/Cylinder Volume | 166.53 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 2380 |
| Same as above plus superheater percentage | 2380 |
| Same as above but substitute firebox area for grate area | 13,300 |
| Power L1 | 3556 |
| Power MT | 181.34 |