Data from Gavin Hamilton's excellent compilation of Garratt data posted at [] (6 September 2005); and A[rthur] E[dward] Durrant, Garratt Locomotives of the World (revised edition) (Newton Abbott, UK: David & Charles, 1981), p. (Thanks to Nick Lera for his 26 September 2024 email helping to untangle the careers of several Garratt classes such as this one.) Works numbers were 7122-7135 in 1943.
These Double Mikado Garratts shared their boiler and firebox designs with the War Department's Light-Metre Double Consolidation Garratt design. Water tankage and fuel bunkerage grew and that increased total engine weight. Hamilton's tables say that adhesion weight decreased, which doesn't seem likely in view of the location of the water tanks over one set of drivers.
The first two engines never arrived as they were lost at sea. The surviving dozen had been delivered by October 1943. After World War II ended, all of the engines transferred to the Burma Railways.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | MWGH/GC |
| Locobase ID | 5801 |
| Railroad | Bengal-Assam |
| Country | India |
| Whyte | 2-8-2+2-8-2 |
| Number in Class | 12 |
| Road Numbers | 74210-74223/831-842 |
| Gauge | Metre |
| Number Built | 14 |
| Builder | Beyer, Peacock |
| Year | 1943 |
| Valve Gear | Walschaert |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | |
| Engine Wheelbase (ft / m) | |
| Ratio of driving wheelbase to overall engine wheelbase | |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 23,520 / 10,669 |
| Weight on Drivers (lbs / kg) | 186,928 / 84,789 |
| Engine Weight (lbs / kg) | 263,984 / 119,741 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | 4320 / 16.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | 6.60 / 6 |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 39 / 991 |
| Boiler Pressure (psi / kPa) | 204.50 / 1410 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 15.5" x 20" / 394x508 (4) |
| Tractive Effort (lbs / kg) | 42,832 / 19428.29 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.36 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | |
| Firebox Area (sq ft / m2) | 187 / 17.38 |
| Grate Area (sq ft / m2) | 43.70 / 4.06 |
| Evaporative Heating Surface (sq ft / m2) | 1742 / 161.90 |
| Superheating Surface (sq ft / m2) | 313 / 29.09 |
| Combined Heating Surface (sq ft / m2) | 2055 / 190.99 |
| Evaporative Heating Surface/Cylinder Volume | 199.41 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 8937 |
| Same as above plus superheater percentage | 10,277 |
| Same as above but substitute firebox area for grate area | 43,978 |
| Power L1 | 8360 |
| Power MT | 788.78 |