Compare locomotives
Add a locomotive
Western Pacific class M-137
In 1931, the Western Pacific ordered the first six articulated 2-8-8-2 locomotives from Baldwin which had to haul the Pacific Fruit Express through the Feather River Canyon. They had four equal cylinders of 26 by 32 i...
| Western Pacific class M-137Remove | |
|---|---|
| Variant | |
| Built | 1938 |
| Manufacturers | Baldwin |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | |
| Service mass | 300777 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Western Pacific class M-137Remove |
|---|---|
| Built | 1938 |
| Manufacturers | Baldwin |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Western Pacific class M-137Remove |
|---|---|
| Length loco | 36.83 m |
| Wheelbase | 18.72 m |
| Total wheelbase | 32.92 m |
| Empty mass | 269 t |
| Service mass | 300.8 t |
| Adhesion mass | 249.3 t |
| Total mass | 483.7 t |
| Rigid wheelbase | 5.03 m |
| Water capacity | 83,279 l |
| Fuel capacity | 22,712 l (oil) |
Boiler
| Property | Western Pacific class M-137Remove |
|---|---|
| Grate area | 13.471 m² |
| Firebox surface | 62.245 m² |
| Tube heating surface | 570.518 m² |
| Evaporative heating surface | 632.763 m² |
| Superheater surface | 199.928 m² |
| Total heating surface | 832.7 m² |
Power plant
| Property | Western Pacific class M-137Remove |
|---|---|
| Driver diameter | 1,600 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | four, 660 x 813 mm |
Power
| Property | Western Pacific class M-137Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,400 kW (5,982 PS) |
| Starting effort | 649.1 kN |
| Starting effort booster | 61.83 kN |
Calculated values
| Property | Western Pacific class M-137Remove |
|---|---|
| Factor of adhesion | 1 : 3.77 |
| Optimal speed | 42 km/h |
| Power-to-weight ratio | 14.6 kW/t |
| Heating Surface Equivalent | 1,343.8 m² |
| Cylinder volume/HSE | 1 : 828.70 |
| Adhesive weight/Total | 1 : 1.21 |
| Tractive force/Heating surface | 1 : 16.28 |
| Grate area/Heating surface | 1 : 61.81 |
| Firebox/Tube surface | 1 : 9.17 |
| Total/Superheater | 1 : 3.16 |
