Data from "Locomotives", Type 78bis, , Usines du Creusot-Schneider et Cie (Creusot: A Temporal, 1875), n.a. Works numbers were 1599-1606 (Type 78), 1613-1617 (Type 78bis) in 1873.
The Ryazan-Vyazma railway ran east-to-west in a 460 km (ca. 285 miles) band just south of Moscow. Locobase doesn't find any significant difference other than weight. The specs show the empty and loaded weights of the Type 78bis. The empty weight for the Type 80 was 29,000 kg (63,934 lb) and loaded 32,500 kg (71,650 kg).
| Principal Dimensions by Steve Llanso of Middle Run Media | |
|---|---|
| Class | Type 78, 78bis |
| Locobase ID | 21215 |
| Railroad | Rjassk Wjasma |
| Country | Russia |
| Whyte | 0-6-0 |
| Number in Class | 6 |
| Road Numbers | |
| Gauge | 5' |
| Number Built | 6 |
| Builder | Schneider-Creusot |
| Year | 1873 |
| Valve Gear | Stephenson |
| Locomotive Length and Weight | |
| Driver Wheelbase (ft / m) | 10.83 / 3.30 |
| Engine Wheelbase (ft / m) | 10.83 / 3.30 |
| Ratio of driving wheelbase to overall engine wheelbase | 1 |
| Overall Wheelbase (engine & tender) (ft / m) | |
| Axle Loading (Maximum Weight per Axle) (lbs / kg) | |
| Weight on Drivers (lbs / kg) | 70,548 / 32,000 |
| Engine Weight (lbs / kg) | 70,548 / 32,000 |
| Tender Loaded Weight (lbs / kg) | |
| Total Engine and Tender Weight (lbs / kg) | |
| Tender Water Capacity (gals / ML) | |
| Tender Fuel Capacity (oil/coal) (gals/tons / Liters/MT) | |
| Minimum weight of rail (calculated) (lb/yd / kg/m) | 39 / 19.50 |
| Geometry Relating to Tractive Effort | |
| Driver Diameter (in / mm) | 47.60 / 1210 |
| Boiler Pressure (psi / kPa) | 118.90 / 820 |
| High Pressure Cylinders (dia x stroke) (in / mm) | 18.11" x 24.02" / 460x610 |
| Tractive Effort (lbs / kg) | 16,726 / 7586.80 |
| Factor of Adhesion (Weight on Drivers/Tractive Effort) | 4.22 |
| Heating Ability | |
| Tubes (number - dia) (in / mm) | 177 - 1.89" / 48 |
| Flues (number - dia) (in / mm) | |
| Flue/Tube length (ft / m) | 13.29 / 4.05 |
| Firebox Area (sq ft / m2) | 79.12 / 7.35 |
| Grate Area (sq ft / m2) | 15.07 / 1.40 |
| Evaporative Heating Surface (sq ft / m2) | 1227 / 113.95 |
| Superheating Surface (sq ft / m2) | |
| Combined Heating Surface (sq ft / m2) | 1227 / 113.95 |
| Evaporative Heating Surface/Cylinder Volume | 171.34 |
| Computations Relating to Power Output (More Information) | |
| Robert LeMassena's Power Computation | 1792 |
| Same as above plus superheater percentage | 1792 |
| Same as above but substitute firebox area for grate area | 9407 |
| Power L1 | 2137 |
| Power MT | 200.34 |