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North British class J “Scott”
Based on the class K for mixed traffic, Reid commissioned the class J for express service. Like the first batch of the class K, the J had a wheel diameter of six feet six inches. The dimensions of the cylinders were a...
General
| Property | North British class J “Scott” Remove |
|---|---|
| Built | 1914-1920 |
| Manufacturers | North British, Cowlairs |
| Wheel arrangement | 4-4-0 (American) |
| Gauge | 1,435 mm (Standard gauge) |
Dimensions and weights
| Property | North British class J “Scott” Remove |
|---|---|
| Wheelbase | 7.19 m |
| Rigid wheelbase | 2.90 m |
| Total wheelbase | 14.24 m |
| Service weight | 58.7 t |
| Adhesive weight | 38.5 t |
| Axle load | 19.7 t |
| Total weight | 106.1 t |
Boiler
| Property | North British class J “Scott” Remove |
|---|---|
| Grate area | 1.963 m² |
| Firebox surface | 12.979 m² |
| Tube heating surface | 94.148 m² |
| Evaporative heating surface | 107.127 m² |
| Superheater surface | 17.921 m² |
| Total heating surface | 125.0 m² |
Power plant
| Property | North British class J “Scott” Remove |
|---|---|
| Driver diameter | 1,981 mm |
| Boiler pressure | 11.4 bar |
| Expansion type | simple expansion |
| Cylinders | two, 508 x 660 mm |
Power
| Property | North British class J “Scott” Remove |
|---|---|
| Power source | steam |
| Estimated power | 708 kW (963 PS) |
| Starting effort | 83.2 kN |
Calculated values
| Property | North British class J “Scott” Remove |
|---|---|
| Factor of adhesion | 1 : 4.54 |
| Optimal speed | 51 km/h |
| Power-to-weight ratio | 12.1 kW/t |
| Heating Surface Equivalent | 207.9 m² |
| Cylinder volume/HSE | 1 : 1,287.88 |
| Adhesive weight/Total | 1 : 1.53 |
| Tractive force/Heating surface | 1 : 13.89 |
| Grate area/Heating surface | 1 : 63.70 |
| Firebox/Tube surface | 1 : 7.25 |
| Total/Superheater | 1 : 5.98 |
