Data from "London, Brighton & South Coast Ry," The Locomotive, Volume 17 (14 January 1911), p. 3
DE Marsh increased the size of his outside-cylinder tank engine by one coupled axle and gained considerable adhesive weight. OS Nock (Southern Steam, 1968) for data.
An April 1953 Railway Gazette article "British 4-6-2 Tank Engines" (pp. 520-524) by WAC Smith tells us that these were the first of this wheel arrangement in the British Isles. Abergavenny was first and had Stephenson inside valve gear, Bessborough followed with Walschaert outside radial gear. Smith says "They were held in great esteem by all those who knew them, and did some fine work on express trains."
Both were moved to the London area in 1933 and worked the heaviest trains until supplanted by 2-6-4Ts in 1950. They were withdrawn in June 1951.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | J1 |
| Locobase ID | 2322 |
| Railroad | London, Brighton & South Coast |
| Country | Great Britain |
| Whyte | 4-6-2T |
| Number in Class | 2 |
| Road Numbers | J325-J326 |
| Gauge | Std |
| Number Built | 2 |
| Builder | |
| Year | 1910 |
| Valve Gear | various |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 14.50 / 4.42 |
| Engine Wheelbase (ft / m) | 35.25 / 10.74 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.41 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 125,440 / 56,899 |
| Engine Weight (lbs / kg) | 192,640 / 87,380 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 192,640 / 87,380 |
| Tender Water Capacity (gals / ML) | 2760 / 10.45 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 3.30 / 3 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 70 / 35 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 79.50 / 2019 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 21" x 26" / 533x660 |
| Tractive Effort (lbs / kg) | 20,841 / 9453.33 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 6.02 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 110 - 2" / 51 |
| Flues (number - dia) (in / mm) | 43 - 4.75" / 121 |
| Flue/Tube length (ft / m) | 13.25 / 4.04 |
| Firebox Area (sq ft / m2) | 124 / 11.52 |
| Grate Area (sq ft / m2) | 25.16 / 2.34 |
| Evaporative Heating Surface (sq ft / m2) | 1586 / 147.34 |
| Superheating Surface (sq ft / m2) | 342 / 31.77 |
| Combined Heating Surface (sq ft / m2) | 1928 / 179.11 |
| Evaporative Heating Surface/Cylinder Volume | 152.17 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4277 |
| Same as above plus superheater percentage | 5047 |
| Same as above but substitute firebox area for grate area | 24,874 |
| Power L1 | 11,419 |
| Power MT | 602.07 |