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Midland classes 690 and 780
From 1869, the Midland Railway had tank locomotives built with two coupled axles and a trailing, two-axle bogie for the London suburban lines. The first six came from Beyer, Peacock & Co. in 1869 and are known as clas...
General
| Property | Midland classes 690 and 780Remove |
|---|---|
| Built | 1869-1870 |
| Manufacturers | Beyer, Peacock & Co., Dübs & Co. |
| Wheel arrangement | 0-4-4WT (Forney) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | Midland classes 690 and 780Remove |
|---|---|
| Wheelbase | 6.93 m |
| Rigid wheelbase | 2.44 m |
| Service weight | 44.4 t |
Boiler
| Property | Midland classes 690 and 780Remove |
|---|---|
| Grate area | 1.579 m² |
| Firebox surface | 9.662 m² |
| Tube heating surface | 92.253 m² |
| Evaporative heating surface | 101.915 m² |
| Total heating surface | 101.9 m² |
Power plant
| Property | Midland classes 690 and 780Remove |
|---|---|
| Driver diameter | 1,575 mm |
| Boiler pressure | 9.7 bar |
| Expansion type | simple expansion |
| Cylinders | two, 432 x 610 mm |
Power
| Property | Midland classes 690 and 780Remove |
|---|---|
| Power source | steam |
| Estimated power | 261 kW (355 PS) |
| Starting effort | 59.2 kN |
Calculated values
| Property | Midland classes 690 and 780Remove |
|---|---|
| Optimal speed | 27 km/h |
| Power-to-weight ratio | 5.9 kW/t |
| Heating Surface Equivalent | 150.2 m² |
| Cylinder volume/HSE | 1 : 1,188.47 |
| Tractive force/Heating surface | 1 : 12.14 |
| Grate area/Heating surface | 1 : 64.54 |
| Firebox/Tube surface | 1 : 9.55 |
