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Great Western Railway class 455 “Metropolitan Tanks”
For the Metropolitan and District Lines in London, Joseph Armstrong designed the class 355, also known as “Metropolitan Tanks” or simply “Metro Tanks”. It was created with a driving wheel diameter of just five feet to...
General
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Built | 1868-1878 |
| Manufacturers | Swindon |
| Wheel arrangement | 2-4-0T (Porter) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Wheelbase | 4.65 m |
| Rigid wheelbase | 2.44 m |
| Service weight | 33.7 t |
| Water capacity | 4,312 l |
Boiler
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Grate area | 1.463 m² |
| Firebox surface | 8.083 m² |
| Tube heating surface | 92.81 m² |
| Evaporative heating surface | 100.893 m² |
| Total heating surface | 100.9 m² |
Power plant
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Driver diameter | 1,524 mm |
| Boiler pressure | 9.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 610 mm |
Power
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Power source | steam |
| Estimated power | 298 kW (405 PS) |
| Starting effort | 54.2 kN |
Calculated values
| Property | Great Western Railway class 455 “Metropolitan Tanks” Armstrong 1869 |
|---|---|
| Optimal speed | 34 km/h |
| Power-to-weight ratio | 8.8 kW/t |
| Heating Surface Equivalent | 141.3 m² |
| Cylinder volume/HSE | 1 : 1,119.19 |
| Tractive force/Heating surface | 1 : 11.22 |
| Grate area/Heating surface | 1 : 68.96 |
| Firebox/Tube surface | 1 : 11.48 |
