Lancashire & Yorkshire class 30 (Hughes)
London, Midland & Scottish class 6F
Great Britain 1907 80 produced
George Hughes produced his first class 30 locomotive by rebuilding a class 30 locomotive from his predecessor Aspinall to a four-cylinder compound. Ten more were created in this form. Other locomotives with two cylinders and simple steam expansion, which were built from 1910 onwards, were also assigned to class 30. 29 of these had been converted from Aspinall's class 30 and 40 more had Hughes built new at Horwich. Later they received superheaters so that they were similar to the class 31. They were assigned to power class 6F by the LMS. The last locomotives survived the formation of British Railways and were retired in 1951.
Technical data
General
| Property | compound | simple |
|---|---|---|
| Built | 1907 | 1910-1918 |
| Manufacturers | Horwich | |
| Wheel arrangement | 0-8-0 (Eight-coupled) | |
| Gauge | 1,435 mm (Standard gauge) | |
Dimensions and weights
| Property | compound | simple |
|---|---|---|
| Wheelbase | 4.98 m | |
| Service mass | 61.8 t | 67.9 t |
| Adhesion mass | 61.8 t | 67.9 t |
| Total mass | 103.9 t | 110 t |
| Rigid wheelbase | 4.98 m | |
| Axle load | 15.4 t | 17.8 t |
| Water capacity | 16,364 l | |
| Fuel capacity | 5.1 t (coal) | |
Boiler
| Property | compound | simple |
|---|---|---|
| Grate area | 2.141 m² | 2.378 m² |
| Firebox surface | 13.657 m² | 17.652 m² |
| Tube heating surface | 164.16 m² | 210.24 m² |
| Evaporative heating surface | 177.817 m² | 227.891 m² |
| Total heating surface | 177.8 m² | 227.9 m² |
Power plant
| Property | compound | simple |
|---|---|---|
| Driver diameter | 1,372 mm | |
| Boiler pressure | 12.4 bar | |
| Expansion type | compound | simple expansion |
| Cylinders | four, HP: 394 x 660 mm and LP: 559 x 660 mm | two, 508 x 660 mm |
Power
| Property | compound | simple |
|---|---|---|
| Power source | steam | |
| Estimated power | 671 kW (912 PS) | 746 kW (1,014 PS) |
| Starting effort | 105.2 kN | 131.1 kN |
| Starting effort simple | 126.3 kN | |
Calculated values
| Property | compound | simple |
|---|---|---|
| Factor of adhesion | 1 : 5.76 | 1 : 5.08 |
| Optimal speed | 39 km/h | 35 km/h |
| Power-to-weight ratio | 10.9 kW/t | 11.0 kW/t |
| Heating Surface Equivalent | 246.1 m² | 316.2 m² |
| Cylinder volume/HSE | 1 : 1,311.45 | 1 : 846.76 |
| Adhesive weight/Total | 1 : 1.00 | |
| Tractive force/Heating surface | 1 : 12.36 | 1 : 12.01 |
| Grate area/Heating surface | 1 : 83.05 | 1 : 95.83 |
| Firebox/Tube surface | 1 : 12.02 | 1 : 11.91 |