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Metropolitan classes A and B
The Metropolitan Line of the London Underground, which opened in 1863, was in need of steam locomotives that were fitted with a condensation device to reduce the amount of steam emitted. Since initially three-rail tra...
General
| Property | Metropolitan classes A and B Remove |
|---|---|
| Built | 1879-1885 |
| Manufacturers | Beyer, Peacock & Co. |
| Wheel arrangement | 4-4-0T (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Metropolitan classes A and B Remove |
|---|---|
| Wheelbase | 6.10 m |
| Rigid wheelbase | 2.69 m |
| Service weight | 45.9 t |
| Adhesive weight | 33 t |
| Axle load | 16.5 t |
| Water capacity | 4,546 l |
| Fuel capacity | 0.9 t (coal) |
Boiler
| Property | Metropolitan classes A and B Remove |
|---|---|
| Grate area | 1.672 m² |
| Firebox surface | 8.436 m² |
| Tube heating surface | 73.969 m² |
| Evaporative heating surface | 82.405 m² |
| Total heating surface | 82.4 m² |
Power plant
| Property | Metropolitan classes A and B Remove |
|---|---|
| Driver diameter | 1,537 mm |
| Boiler pressure | 9 bar |
| Expansion type | simple expansion |
| Cylinders | two, 406 x 508 mm |
Power
| Property | Metropolitan classes A and B Remove |
|---|---|
| Power source | steam |
| Estimated power | 239 kW (325 PS) |
| Starting effort | 41.6 kN |
Calculated values
| Property | Metropolitan classes A and B Remove |
|---|---|
| Factor of adhesion | 1 : 7.78 |
| Optimal speed | 35 km/h |
| Power-to-weight ratio | 5.2 kW/t |
| Heating Surface Equivalent | 124.6 m² |
| Cylinder volume/HSE | 1 : 1,057.85 |
| Adhesive weight/Total | 1 : 1.39 |
| Tractive force/Heating surface | 1 : 10.54 |
| Grate area/Heating surface | 1 : 49.29 |
| Firebox/Tube surface | 1 : 8.77 |
