Compare locomotives
Add a locomotive
Denver & Rio Grande Western classes M-67 and M-78
The class M-67 were the first Mountains introduced into service by the D&RGW. In 1922, the press presented them as “largest passenger locomotives in the world”. To enable high average speeds over mountainous lines, th...
| Denver & Rio Grande Western classes M-67 and M-78Remove | |
|---|---|
| Variant | |
| Built | 1922-1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 2D1 |
| Gauge | 1435 mm |
| Length | |
| Service mass | 171005 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Built | 1922-1923 |
| Manufacturers | ALCO |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Wheelbase | 12.14 m |
| Total wheelbase | 25.07 m |
| Service mass | 171 t |
| Adhesion mass | 116.8 t |
| Total mass | 296.9 t |
| Rigid wheelbase | 3.40 m |
| Axle load | 29.3 t |
| Water capacity | 52,996 l |
| Fuel capacity | 18.1 t (coal) |
Boiler
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Grate area | 7.451 m² |
| Firebox surface | 39.484 m² |
| Tube heating surface | 394.095 m² |
| Evaporative heating surface | 433.579 m² |
| Superheater surface | 123.84 m² |
| Total heating surface | 557.4 m² |
Power plant
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 14.5 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,535 kW (3,447 PS) |
| Starting effort | 296.4 kN |
Calculated values
| Property | Denver & Rio Grande Western classes M-67 and M-78Remove |
|---|---|
| Factor of adhesion | 1 : 3.87 |
| Optimal speed | 53 km/h |
| Power-to-weight ratio | 14.8 kW/t |
| Heating Surface Equivalent | 878.7 m² |
| Cylinder volume/HSE | 1 : 689.01 |
| Adhesive weight/Total | 1 : 1.46 |
| Tractive force/Heating surface | 1 : 11.11 |
| Grate area/Heating surface | 1 : 74.81 |
| Firebox/Tube surface | 1 : 9.98 |
| Total/Superheater | 1 : 3.50 |
