Data from "Superheater Loco. for the Midlant Ry, Northern Counties Committee", Locomotive Magazine, Volume XX [20] (14 November 1914), p. 282
Superheated simple-expansion engines of a surprisingly dated look for the year. Still, they had some interesting features including a great deal of superheater area for the relatively small boiler. Designed by Bowman Malcolm, Locomotive Superintendent and Engineer of NCC's Belfast shed.
The pair proved a useful size and operated into the 1930s.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | unknown |
| Locobase ID | 2763 |
| Railroad | Midland |
| Country | Ireland |
| Whyte | 4-4-0 |
| Number in Class | 2 |
| Road Numbers | 78 |
| Gauge | 5'3" |
| Number Built | 2 |
| Builder | Derby |
| Year | 1914 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 8.17 / 2.49 |
| Engine Wheelbase (ft / m) | 21.25 / 6.48 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.38 |
| Overall Wheelbase (engine & tender) (ft / m) | 40.92 / 12.47 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 69,888 / 31,701 |
| Engine Weight (lbs / kg) | 106,624 / 48,364 |
| Tender Loaded Weight (lbs / kg) | 65,520 / 29,719 |
| Total Engine and Tender Weight (lbs / kg) | 172,144 / 78,083 |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 58 / 29 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 72 / 1829 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 24" / 483x610 |
| Tractive Effort (lbs / kg) | 17,388 / 7887.07 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 110.50 / 10.27 |
| Grate Area (sq ft / m2) | 18 / 1.67 |
| Evaporative Heating Surface (sq ft / m2) | 987 / 91.70 |
| Superheating Surface (sq ft / m2) | 275 / 25.55 |
| Combined Heating Surface (sq ft / m2) | 1262 / 117.25 |
| Evaporative Heating Surface/Cylinder Volume | 125.32 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 3060 |
| Same as above plus superheater percentage | 3733 |
| Same as above but substitute firebox area for grate area | 22,918 |
| Power L1 | 10,398 |
| Power MT | 656.01 |