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Norfolk & Western classes Y4a, Y5 and Y6
The last generation in their series of 2-8-8-2 Mallets , begun in 1910, was built by Norfolk & Western from 1930. While most other North American railroads had long since abandoned real Mallets and introduced ones wit...
| Norfolk & Western classes Y4a, Y5 and Y6Remove | |
|---|---|
| Variant | |
| Built | 1930-1931 |
| Manufacturers | Roanoke |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | 35014 mm |
| Service mass | 264399 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Built | 1930-1931 |
| Manufacturers | Roanoke |
| Wheel arrangement | 2-8-8-2 (Mikado Mallet) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Length | 35.01 m |
| Wheelbase | 17.68 m |
| Total wheelbase | 4.80 m |
| Service mass | 264.4 t |
| Adhesion mass | 237.2 t |
| Total mass | 436.1 t |
| Rigid wheelbase | 31.32 m |
| Water capacity | 83,279 l |
| Fuel capacity | 24.7 t (coal) |
Boiler
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Grate area | 9.866 m² |
| Firebox surface | 39.948 m² |
| Tube heating surface | 501.119 m² |
| Evaporative heating surface | 541.068 m² |
| Superheater surface | 146.973 m² |
| Total heating surface | 688.0 m² |
Power plant
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Driver diameter | 1,448 mm |
| Boiler pressure | 20.7 bar |
| Expansion type | compound |
| Cylinders | four, HP: 635 x 813 mm and LP: 991 x 813 mm |
Power
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Power source | steam |
| Estimated power | 4,474 kW (6,083 PS) |
| Starting effort | 564.2 kN |
| Starting effort simple | 677.0 kN |
Calculated values
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Factor of adhesion | 1 : 4.12 |
| Optimal speed | 48 km/h |
| Power-to-weight ratio | 16.9 kW/t |
| Heating Surface Equivalent | 1,034.8 m² |
| Cylinder volume/HSE | 1 : 1,102.91 |
| Adhesive weight/Total | 1 : 1.11 |
| Tractive force/Heating surface | 1 : 17.13 |
| Grate area/Heating surface | 1 : 69.74 |
| Firebox/Tube surface | 1 : 12.54 |
| Total/Superheater | 1 : 3.68 |
