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The reference for locomotives and railcars

Great Western Railway class 7200

Great Britain 1934 54 produced
No. 7221 in April 1951 at Severn Tunnel Junction Depot Ben Brooksbank CC BY-SA 2.0

These 2-8-2T tank locomotives were created by the addition of a trailing axle to 2-8-0T locomotives, alongside a four-feet extension of the frames to increase the capacity of the coal bunker. They were intended for heavy short distance coal trains in South Wales. Starting in 1934, 40 were rebuilt from the class 5205. 14 more were created from the class 4200 which also got cylinders with a diameter of 19 instead of 18.5 inches. These 14 and four of the first batch had “Coal Scuttle” bunkers which increased the water capacity from 2,400 to 2,700 gallons, while decreasing the coal capaity from six to five tons.

Although these locomotives were too long for some sidings, they fulfilled their job in heavy coal traffic. Some were used in ore and stone traffic in England, but the introduction of more powerful goods locomotives brought them back to South Wales after World War II. British Railways assigned them to power class 8F. They still survived until the sixties, with withdrawals between 1962 and 1965. Three have been rescued from the scrapyard on Barry Island. Numbers 7200 and 7202 are currently under restoration. The third one is 7229 that is still waiting for its restoration to start.

Technical data

General

Built
1934-1939
Manufacturers
Swindon
Wheel arrangement
2-8-2T (Mikado)
Gauge
1,435 mm (Standard gauge)

Dimensions and weights

Length
13.67 m
Wheelbase
10.74 m
Rigid wheelbase
6.10 m
Service weight
94.1 t
Adhesive weight
73.9 t
Axle load
19 t
Water capacity
10,910 l
Fuel capacity
6.1 t (coal)

Boiler

Grate area
1.91 m²
Firebox surface
11.958 m²
Tube heating surface
125.386 m²
Evaporative heating surface
137.344 m²
Superheater surface
17.818 m²
Total heating surface
155.2 m²

Power plant

Driver diameter
1,410 mm
Boiler pressure
13.8 bar
Cylinders
two, 483 x 762 mm

Power

Estimated power
783 kW (1,065 PS)

Calculated values

Optimal speed
32 km/h
Power-to-weight ratio
8.3 kW/t
Heating Surface Equivalent
232.8 m²
Cylinder volume/HSE
1 : 1,197.63
Adhesive weight/Total
1 : 1.27
Grate area/Heating surface
1 : 81.24
Firebox/Tube surface
1 : 10.49
Total/Superheater
1 : 7.71
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