Great Western 2-8-2 Locomotives in Great_Britain
Class Details by Steve Llanso of Sweat House Media
Class 72xx (Locobase 3589)
See [
] (Information by John Daniel, 2000) for details on this class, including all names. Additional information from [] (30 June 2003). (Very little data differences -- the latter source gives the diameter for the flues as 5.625 in)
These conversions of the class 4200, 5200 2-8-0T were successful, although their tendency to derail on sharp curves put many sidings off limits to them. They had markedly tapered boilers and Belpaire fireboxes.
Some of these tanks saw out steam in Britain, being retired in 1965.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | 72xx |
| Locobase ID | 3589 |
| Railroad | Great Western |
| Country | Great Britain |
| Whyte | 2-8-2T |
| Number in Class | 54 |
| Road Numbers | 7200-7253 |
| Gauge | Std |
| Number Built | 54 |
| Builder | GWR - Swindon |
| Year | 1934 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 20 / 6.10 |
| Engine Wheelbase (ft / m) | 35.25 / 10.74 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.57 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 41,888 / 19,000 |
| Weight on Drivers (lbs / kg) | 162,960 / 73,918 |
| Engine Weight (lbs / kg) | 207,760 / 94,238 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | 207,760 / 94,238 |
| Tender Water Capacity (gals / ML) | 3240 / 12.27 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 5.50 / 5 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 68 / 34 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 55.50 / 1410 |
| Boiler Pressure (psi / kPa) | 200 / 1380 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 19" x 30" / 483x762 |
| Tractive Effort (lbs / kg) | 33,173 / 15047.04 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.91 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 235 - 1.625" / 41 |
| Flues (number - dia) (in / mm) | 14 - 5.125" / 130 |
| Flue/Tube length (ft / m) | 11 / 3.35 |
| Firebox Area (sq ft / m2) | 128.72 / 11.96 |
| Grate Area (sq ft / m2) | 20.56 / 1.91 |
| Evaporative Heating Surface (sq ft / m2) | 1478 / 137.36 |
| Superheating Surface (sq ft / m2) | 192 / 17.84 |
| Combined Heating Surface (sq ft / m2) | 1670 / 155.20 |
| Evaporative Heating Surface/Cylinder Volume | 150.13 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4112 |
| Same as above plus superheater percentage | 4564 |
| Same as above but substitute firebox area for grate area | 28,576 |
| Power L1 | 7234 |
| Power MT | 391.46 |