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London & South Western class M7
Dugald Drummond's first design for the LSWR was the class M7 0-4-4T tank locomotive , which was the larger successor to Adams' T1. While the driver diameter remained the same, over all the grate was enlarged, resultin...
| London & South Western class M7Remove | |
|---|---|
| Variant | as built |
| Built | 1897-1911 |
| Manufacturers | Nine Elms;Eastleigh |
| Wheel arrangement | B2 t |
| Gauge | 1435 mm |
| Length | 10566 mm |
| Service mass | 61115 kg |
| Top speed | |
| Power | |
| Engine |
General
| Property | London & South Western class M7as built |
|---|---|
| Built | 1897-1911 |
| Manufacturers | Nine Elms, Eastleigh |
| Wheel arrangement | 0-4-4T (Forney) |
| Gauge | 1,435 mm |
Dimensions and weights
| Property | London & South Western class M7as built |
|---|---|
| Length | 10.57 m |
| Wheelbase | 7.19 m |
| Service mass | 61.1 t |
| Adhesion mass | 35.9 t |
| Rigid wheelbase | 2.29 m |
| Water capacity | 5,909 l |
| Fuel capacity | 3.3 t (coal) |
Boiler
| Property | London & South Western class M7as built |
|---|---|
| Grate area | 1.892 m² |
| Firebox surface | 11.511 m² |
| Tube heating surface | 99.23 m² |
| Evaporative heating surface | 110.741 m² |
| Total heating surface | 110.7 m² |
Power plant
| Property | London & South Western class M7as built |
|---|---|
| Driver diameter | 1,702 mm |
| Boiler pressure | 12.1 bar |
| Expansion type | simple expansion |
| Cylinders | two, 470 x 660 mm |
Power
| Property | London & South Western class M7as built |
|---|---|
| Power source | steam |
| Estimated power | 522 kW (710 PS) |
| Starting effort | 87.9 kN |
Calculated values
| Property | London & South Western class M7as built |
|---|---|
| Factor of adhesion | 1 : 4.00 |
| Optimal speed | 37 km/h |
| Power-to-weight ratio | 8.5 kW/t |
| Heating Surface Equivalent | 168.3 m² |
| Cylinder volume/HSE | 1 : 1,361.02 |
| Adhesive weight/Total | 1 : 1.70 |
| Tractive force/Heating surface | 1 : 16.57 |
| Grate area/Heating surface | 1 : 58.53 |
| Firebox/Tube surface | 1 : 8.62 |
