London, Midland & Scottish Stanier 3P 2-6-2T
Great Britain 1935 139 produced
Stanier developed these locos from Fowler's 2-6-2T. The biggest change was in the new boiler, which was tapered towards the front. The locomotives with the numbers 71 to 120 and 121 to 144 each used a slightly different variant of boiler type No. 6 without a dome. Numbers 145 to 209 had boiler no. 6A with a feed and a steam dome. In general, the locomotives are referred to as Stanier's least successful design. Among other things, the extremely small superheater surface is mentioned. Six of them were later given the 6B boiler, but this was not cost-effective. Nevertheless, they were only withdrawn between 1959 and 1962.
Technical data
General
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Built | 1935 | 1937-1938 | 1940-1956 | |
| Manufacturers | Derby | Derby, Crewe | Crewe | |
| Wheel arrangement | 2-6-2T (Prairie) | |||
| Gauge | 1,435 mm (Standard gauge) | |||
Dimensions and weights
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Length | 12.80 m | |||
| Wheelbase | 10.14 m | |||
| Service mass | 71.9 t | 72.4 t | 73.7 t | |
| Adhesion mass | 47.2 t | |||
| Rigid wheelbase | 5.03 m | |||
| Axle load | 15.7 t | |||
| Water capacity | 6,818 l | |||
| Fuel capacity | 3 t (coal) | |||
Boiler
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Grate area | 1.626 m² | 1.788 m² | ||
| Firebox surface | 9.662 m² | 9.941 m² | 10.312 m² | |
| Tube heating surface | 72 m² | 79.804 m² | 87.236 m² | 92.624 m² |
| Evaporative heating surface | 81.662 m² | 89.744 m² | 97.177 m² | 102.937 m² |
| Superheater surface | 6.782 m² | 7.061 m² | 7.432 m² | 12.821 m² |
| Total heating surface | 88.4 m² | 96.8 m² | 104.6 m² | 115.8 m² |
Power plant
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Driver diameter | 1,600 mm | |||
| Boiler pressure | 13.8 bar | |||
| Expansion type | simple expansion | |||
| Cylinders | two, 444 x 660 mm | |||
Power
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Power source | steam | |||
| Estimated power | 619 kW (842 PS) | 671 kW (912 PS) | 690 kW (938 PS) | 708 kW (963 PS) |
| Starting effort | 95.6 kN | |||
Calculated values
| Property | 71-120 | 121-144 | 145-209 | rebuilt 6B boiler |
|---|---|---|---|---|
| Factor of adhesion | 1 : 4.84 | |||
| Optimal speed | 40 km/h | 43 km/h | 45 km/h | |
| Power-to-weight ratio | 8.6 kW/t | 9.3 kW/t | 9.5 kW/t | 9.6 kW/t |
| Heating Surface Equivalent | 143.5 m² | 153.6 m² | 161.7 m² | 180.1 m² |
| Cylinder volume/HSE | 1 : 1,427.94 | 1 : 1,334.62 | 1 : 1,267.18 | 1 : 1,137.80 |
| Adhesive weight/Total | 1 : 1.52 | 1 : 1.53 | 1 : 1.56 | |
| Tractive force/Heating surface | 1 : 22.57 | 1 : 20.62 | 1 : 19.08 | 1 : 17.24 |
| Grate area/Heating surface | 1 : 54.39 | 1 : 54.14 | 1 : 58.51 | 1 : 64.74 |
| Firebox/Tube surface | 1 : 7.45 | 1 : 8.03 | 1 : 8.78 | 1 : 8.98 |
| Total/Superheater | 1 : 12.04 | 1 : 12.71 | 1 : 13.08 | 1 : 8.03 |
