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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 | 1948-1952 |
| Manufacturers | Roanoke |
| Wheel arrangement | (1D)D1 ma |
| Gauge | 1435 mm |
| Length | 35014 mm |
| Service mass | 277381 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Built | 1948-1952 |
| 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 | 277.4 t |
| Adhesion mass | 248.8 t |
| Total mass | 449.1 t |
| Rigid wheelbase | 31.60 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 | 51.561 m² |
| Tube heating surface | 405.058 m² |
| Evaporative heating surface | 456.619 m² |
| Superheater surface | 137.311 m² |
| Total heating surface | 593.9 m² |
Power plant
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Driver diameter | 1,473 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 | 4,623 kW (6,286 PS) |
| Starting effort | 554.4 kN |
| Starting effort simple | 665.3 kN |
Calculated values
| Property | Norfolk & Western classes Y4a, Y5 and Y6Remove |
|---|---|
| Factor of adhesion | 1 : 4.40 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 16.7 kW/t |
| Heating Surface Equivalent | 989.0 m² |
| Cylinder volume/HSE | 1 : 1,153.88 |
| Adhesive weight/Total | 1 : 1.11 |
| Tractive force/Heating surface | 1 : 19.50 |
| Grate area/Heating surface | 1 : 60.20 |
| Firebox/Tube surface | 1 : 7.86 |
| Total/Superheater | 1 : 3.33 |
