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Hejaz Railway No. 21 to 23
In 1951, Robert Stephenson & Hawthorns built three oil-fired Mikados for the Jordanian part of the Hejaz Railway. Their works numbers were 7431 to 7433 and the railway gave them the numbers 21 to 23. They were based o...
General
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Built | 1951 |
| Manufacturers | Robert Stephenson & Hawthorns |
| Wheel arrangement | 2-8-2 (Mikado) |
| Gauge | 1,049 mm |
Dimensions and weights
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Length | 18.64 m |
| Wheelbase | 9.79 m |
| Rigid wheelbase | 4.09 m |
| Total wheelbase | 15.82 m |
| Service weight | 56.5 t |
| Adhesive weight | 37.9 t |
| Axle load | 11.6 t |
| Total weight | 96.8 t |
| Water capacity | 13,639 l |
| Fuel capacity | 7,503 l (oil) |
Boiler
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Grate area | 2.415 m² |
| Firebox surface | 12.356 m² |
| Tube heating surface | 115.943 m² |
| Evaporative heating surface | 128.299 m² |
| Superheater surface | 28.614 m² |
| Total heating surface | 156.9 m² |
Power plant
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Driver diameter | 1,219 mm |
| Boiler pressure | 12.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 610 mm |
Power
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Power source | steam |
| Estimated power | 820 kW (1,115 PS) |
| Starting effort | 98.3 kN |
Calculated values
| Property | Hejaz Railway No. 21 to 23Remove |
|---|---|
| Factor of adhesion | 1 : 3.78 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 14.5 kW/t |
| Heating Surface Equivalent | 247.3 m² |
| Cylinder volume/HSE | 1 : 721.93 |
| Adhesive weight/Total | 1 : 1.49 |
| Tractive force/Heating surface | 1 : 13.09 |
| Grate area/Heating surface | 1 : 64.97 |
| Firebox/Tube surface | 1 : 9.38 |
| Total/Superheater | 1 : 4.48 |
