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Great Western Railway class 3700 “City”
In 1902, the GWR rebuilt a 4-4-0 Atbara class locomotive with a new domeless taper boiler with Belpaire firebox . This was No. 3405 “Mauritius”, which now served as a prototype for the new City class. Ten more of this...
General
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Built | 1902-1909 |
| Manufacturers | Swindon |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Wheelbase | 6.55 m |
| Rigid wheelbase | 2.59 m |
| Service weight | 56.2 t |
| Adhesive weight | 36.7 t |
| Axle load | 18.6 t |
| Total weight | 93.5 t |
| Water capacity | 16,364 l |
| Fuel capacity | 5.1 t (coal) |
Boiler
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Grate area | 1.91 m² |
| Firebox surface | 11.919 m² |
| Tube heating surface | 150.661 m² |
| Evaporative heating surface | 162.58 m² |
| Total heating surface | 162.6 m² |
Power plant
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Driver diameter | 2,045 mm |
| Boiler pressure | 13.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 457 x 660 mm |
Power
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Power source | steam |
| Estimated power | 634 kW (862 PS) |
| Starting effort | 77.2 kN |
Calculated values
| Property | Great Western Railway class 3700 “City” as built |
|---|---|
| Factor of adhesion | 1 : 4.66 |
| Optimal speed | 50 km/h |
| Power-to-weight ratio | 11.3 kW/t |
| Heating Surface Equivalent | 222.2 m² |
| Cylinder volume/HSE | 1 : 975.99 |
| Adhesive weight/Total | 1 : 1.53 |
| Tractive force/Heating surface | 1 : 9.91 |
| Grate area/Heating surface | 1 : 85.12 |
| Firebox/Tube surface | 1 : 12.64 |
