Data from William Kent, MCE, "Narrow-gauge Railways in Manufacturing Works", The Mechanical Engineer's Pocket Book (7th Ed) (New York: John Wiley and Sons, 1907), p. 865. See Also Daniel Kinnear Clark, Tramways: Their Construction and Working (2nd Ed), (London: Crosby, Lockwood & Son, 1894), pp. 476-478. Works numbers were 2833-2834, 2825 in 1887 (Dot, Robin, Wren). Horwich added 2 in 1891 (Wasp, Fly), 2 in 1899 (Mouse, Midget), and 1 in 1901 (Bee).
See Locobase 10795 for a very similar engine built at the same time.
This little design represented all of the industrial locomotives for Kent, who most likely did not update this entry from first edition to seventh. He noted that the curve radii in the yard were as tight as 13 feet. Clark notes how low-slung the engine had to be with the boiler's top line only 2 ft 9 1/2" above the rails and the chimney (stack) topping out at 7 ft 4 1/2".
The clutch of 18-inchers continued to serve the 7 1/2-mile tramway network in the works into the 20th Century, as reported in J F Gairns's article on "Locomotives for Special Service on British Railways", Engineering Magazine, Volume 26 (1904), pp. 700-712 . Gairns's table of specification shows 54 tubes and 7.22 sq ft of direct heating surface; this may represent the Horwich batch of locomotives.
Most of these retired in the 1930s but Wren ran until the 1960s and was preserved.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Dot |
| Locobase ID | 9959 |
| Railroad | Lancashire & Yorkshire works tramway |
| Country | Great Britain |
| Whyte | 0-4-0T |
| Number in Class | 3 |
| Road Numbers | |
| Gauge | 18 in |
| Number Built | 3 |
| Builder | Beyer, Peacock |
| Year | 1887 |
| Valve Gear | |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 2.75 / 0.84 |
| Engine Wheelbase (ft / m) | 2.75 / 0.84 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | 2.75 / 0.84 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 7145 / 3241 |
| Engine Weight (lbs / kg) | 7145 / 3241 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 32 / 0.12 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 6 / 3 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 16.30 / 414 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 5" x 6" / 127x152 |
| Tractive Effort (lbs / kg) | 1330 / 603.28 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 5.37 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 55 - 1.375" / 35 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 2 / 0.61 |
| Firebox Area (sq ft / m2) | 10.42 / 0.97 |
| Grate Area (sq ft / m2) | 1.78 / 0.17 |
| Evaporative Heating Surface (sq ft / m2) | 47 / 4.37 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 47 / 4.37 |
| Evaporative Heating Surface/Cylinder Volume | 344.69 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 303 |
| Same as above plus superheater percentage | 303 |
| Same as above but substitute firebox area for grate area | 1771 |
| Power L1 | 3357 |
| Power MT | 2071.63 |