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Pennsylvania classes M1 and M1a
The PRR's first Mountain was created in 1923 by placing the boiler of the Class I1s Decapod on a new frame. After testing the prototype, 175 production locomotives were built by Baldwin and 25 by Lima. In 1930, 50, 25...
General
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Built | 1930 |
| Manufacturers | Altoona, Baldwin, Lima |
| Wheel arrangement | 4-8-2 (Mountain) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Length | 26.71 m |
| Wheelbase | 12.75 m |
| Rigid wheelbase | 5.74 m |
| Total wheelbase | 24.18 m |
| Service weight | 176.9 t |
| Adhesive weight | 122.9 t |
| Axle load | 31.8 t |
| Total weight | 348.5 t |
| Water capacity | 83,355 l |
| Fuel capacity | 28.6 t (coal) |
Boiler
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Grate area | 6.494 m² |
| Firebox surface | 36.883 m² |
| Tube heating surface | 399.948 m² |
| Evaporative heating surface | 436.831 m² |
| Superheater surface | 151.432 m² |
| Total heating surface | 588.3 m² |
Power plant
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Driver diameter | 1,829 mm |
| Boiler pressure | 17.2 bar |
| Expansion type | simple expansion |
| Cylinders | two, 711 x 762 mm |
Power
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Power source | steam |
| Estimated power | 2,610 kW (3,549 PS) |
| Starting effort | 308.8 kN |
Calculated values
| Property | Pennsylvania classes M1 and M1a Remove |
|---|---|
| Factor of adhesion | 1 : 3.91 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 14.8 kW/t |
| Heating Surface Equivalent | 924.1 m² |
| Cylinder volume/HSE | 1 : 655.14 |
| Adhesive weight/Total | 1 : 1.44 |
| Tractive force/Heating surface | 1 : 10.96 |
| Grate area/Heating surface | 1 : 90.59 |
| Firebox/Tube surface | 1 : 10.84 |
| Total/Superheater | 1 : 2.88 |
