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The reference for locomotives and railcars

Midland class 3

London, Midland & Scottish class 3P

Great Britain 1900 80 produced
Locomotive Magazine, September 1905

For the increased weight of express trains at the turn of the century, Johnson developed the class 3 with the 4-4-0 wheel arrangement. It was the first locomotive on the Midland Railway to have a Belpaire firebox, which increased its heating surface and therefore also power. Between 1900 and 1905, 80 were built, of which the last 15 received a slightly larger boiler.

Between 1913 and 1926, 73 of the locomotives received a new standard boiler with superheater. The remaining seven remained in use without superheaters until 1925 or 1926. Number 714 was destroyed in the Charfield accident in October 1928, in which 16 people died and 41 were injured. The decommissioning of the remaining ones began in 1935 and was not completed until 1953, when the last ones had already been taken over by the British Railways.

Technical data

General

Built
1900-1905
Manufacturers
Derby
Wheel arrangement
4-4-0 (American)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Wheelbase
6.83 m
Total wheelbase
14.43 m
Service mass
52.7 t
Adhesion mass
35.2 t
Total mass
105.9 t
Rigid wheelbase
2.90 m
Axle load
18.6 t
Water capacity
20,456 l
Fuel capacity
4.1 t (coal)

Boiler

Grate area
2.323 m²
Firebox surface
13.471 m²
Tube heating surface
127.649 m²
Evaporative heating surface
141.12 m²
Total heating surface
141.1 m²

Power plant

Driver diameter
2,057 mm
Boiler pressure
12.4 bar
Expansion type
simple expansion
Cylinders
two, 495 x 660 mm

Power

Power source
steam
Estimated power
634 kW (862 PS)
Starting effort
83.1 kN

Calculated values

Factor of adhesion
1 : 4.15
Optimal speed
47 km/h
Power-to-weight ratio
12.0 kW/t
Heating Surface Equivalent
208.5 m²
Cylinder volume/HSE
1 : 1,220.70
Adhesive weight/Total
1 : 1.50
Tractive force/Heating surface
1 : 12.29
Grate area/Heating surface
1 : 60.75
Firebox/Tube surface
1 : 9.48
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