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Midland class 3
For the increased weight of express trains at the turn of the century, Johnson developed the class 3 with the 4-4-0 wheel arrangement. It was the first locomotive on the Midland Railway to have a Belpaire firebox , wh...
General
| Property | Midland class 3Remove |
|---|---|
| Built | 1900-1905 |
| Manufacturers | Derby |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Midland class 3Remove |
|---|---|
| Wheelbase | 6.83 m |
| Rigid wheelbase | 2.90 m |
| Total wheelbase | 14.43 m |
| Service weight | 52.7 t |
| Adhesive weight | 35.2 t |
| Axle load | 18.6 t |
| Total weight | 105.9 t |
| Water capacity | 20,456 l |
| Fuel capacity | 4.1 t (coal) |
Boiler
| Property | Midland class 3Remove |
|---|---|
| Grate area | 2.323 m² |
| Firebox surface | 13.471 m² |
| Tube heating surface | 127.649 m² |
| Evaporative heating surface | 141.12 m² |
| Total heating surface | 141.1 m² |
Power plant
| Property | Midland class 3Remove |
|---|---|
| Driver diameter | 2,057 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 495 x 660 mm |
Power
| Property | Midland class 3Remove |
|---|---|
| Power source | steam |
| Estimated power | 634 kW (862 PS) |
| Starting effort | 83.1 kN |
Calculated values
| Property | Midland class 3Remove |
|---|---|
| Factor of adhesion | 1 : 4.15 |
| Optimal speed | 47 km/h |
| Power-to-weight ratio | 12.0 kW/t |
| Heating Surface Equivalent | 208.5 m² |
| Cylinder volume/HSE | 1 : 1,220.70 |
| Adhesive weight/Total | 1 : 1.50 |
| Tractive force/Heating surface | 1 : 12.29 |
| Grate area/Heating surface | 1 : 60.75 |
| Firebox/Tube surface | 1 : 9.48 |
