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Western Maryland class M-2
The class M-2 consisted of twelve 4-6-6-4 “Challenger” articulated locomotives built in 1940 and 1941 by Baldwin. Designed for fast freight over the long climbs of the Western Maryland, they had drivers of 69 inches a...
General
| Property | Western Maryland class M-2Remove |
|---|---|
| Built | 1940-1941 |
| Manufacturers | Baldwin |
| Wheel arrangement | 4-6-6-4 (Challenger) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Western Maryland class M-2Remove |
|---|---|
| Length | 37.31 m |
| Wheelbase | 18.39 m |
| Rigid wheelbase | 3.66 m |
| Total wheelbase | 32.31 m |
| Empty weight | 242.8 t |
| Service weight | 272.6 t |
| Adhesive weight | 182.5 t |
| Axle load | 30.6 t |
| Total weight | 462.6 t |
| Water capacity | 83,279 l |
| Fuel capacity | 27.2 t (coal) |
Boiler
| Property | Western Maryland class M-2Remove |
|---|---|
| Grate area | 11.037 m² |
| Firebox surface | 73.951 m² |
| Tube heating surface | 462.1 m² |
| Evaporative heating surface | 536.051 m² |
| Superheater surface | 161.187 m² |
| Total heating surface | 697.2 m² |
Power plant
| Property | Western Maryland class M-2Remove |
|---|---|
| Driver diameter | 1,753 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | four, 559 x 813 mm |
Power
| Property | Western Maryland class M-2Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,101 kW (5,576 PS) |
| Starting effort | 424.4 kN |
Calculated values
| Property | Western Maryland class M-2Remove |
|---|---|
| Factor of adhesion | 1 : 4.22 |
| Optimal speed | 60 km/h |
| Power-to-weight ratio | 15.0 kW/t |
| Heating Surface Equivalent | 1,228.2 m² |
| Cylinder volume/HSE | 1 : 649.21 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 12.71 |
| Grate area/Heating surface | 1 : 63.17 |
| Firebox/Tube surface | 1 : 6.25 |
| Total/Superheater | 1 : 3.33 |
