Data from "Heavy Tank Locomotives, Bengal Nagpur Railway", Locomotive Magazine, Volume XXIII [23] (15 August 1917), p. 154.
These Mikado tanks served the BN's Colliery District, as their specifications might have predicted. Chief mechanical engineer A C Carr prepared the specifications and requirements under the supervision of consulting engineers Sir John Wolfe Barry & Partners.
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | L |
| Locobase ID | 20535 |
| Railroad | Bengal Nagpur |
| Country | India |
| Whyte | 2-8-2T |
| Number in Class | |
| Road Numbers | 435 |
| Gauge | 5'6" |
| Number Built | |
| Builder | Robert Stephenson & Co |
| Year | 1915 |
| Valve Gear | Trick |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 15.08 / 4.60 |
| Engine Wheelbase (ft / m) | 28.33 / 8.63 |
| Ratio of driving wheelbase to overall engine wheelbase | 0.53 |
| Overall Wheelbase (engine & tender) (ft / m) | 28.33 / 8.63 |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | 33,712 / 15,292 |
| Weight on Drivers (lbs / kg) | 134,848 / 61,166 |
| Engine Weight (lbs / kg) | 176,624 / 80,115 |
| Tender Loaded Weight (lbs / kg) | 81,872 / 37,137 |
| Total Engine and Tender Weight (lbs / kg) | 258,496 / 117,252 |
| Tender Water Capacity (gals / ML) | 1680 / 6.36 |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 56 / 28 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 51 / 1295 |
| Boiler Pressure (psi / kPa) | 170 / 1170 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 20" x 26" / 508x660 |
| Tractive Effort (lbs / kg) | 29,467 / 13366.02 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.58 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 10.50 / 3.20 |
| Firebox Area (sq ft / m2) | 147.60 / 13.71 |
| Grate Area (sq ft / m2) | 27.20 / 2.53 |
| Evaporative Heating Surface (sq ft / m2) | 1451 / 134.80 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1451 / 134.80 |
| Evaporative Heating Surface/Cylinder Volume | 153.48 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 4624 |
| Same as above plus superheater percentage | 4624 |
| Same as above but substitute firebox area for grate area | 25,092 |
| Power L1 | 3346 |
| Power MT | 218.81 |