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West Midland No. 106 to 111
Great Western Railway No. 196 to 201
Great Britain | 1862 | 6 produced
No. 197 as built
No. 197 as built
Locomotive Magazine, September 1915

In 1862, the West Midland Railway ordered six express locomotives with a 2-4-0 wheel arrangement from Beyer, Peacock & Co. for their topographically more demanding routes. They featured straight outer frames and a polished brass steam dome. At the same time, six locomotives with the wheel arrangement 2-2-2 were built, which had the same boiler. As early as 1863, the WMR was merged into the GWR, with the locomotives being given the numbers 196 to 201.

No. 201 after rebuild to a tank locomotive
No. 201 after rebuild to a tank locomotive
Locomotive Magazine, October 1915

In the years 1879 to 1881 three of the locomotives were converted into tank locomotives, giving them a slightly longer wheelbase, a new boiler and larger cylinders. Number 198 was also rebuilt in 1884 with the same boiler and cylinders, but remained a tender locomotive

No. 197 after the renewed rebuild to a tender locomotive
No. 197 after the renewed rebuild to a tender locomotive
Locomotive Magazine, October 1915

Since the conversion of the 198 obviously proved to be the best, the three locomotives that had already been converted into tank locomotives and the remaining two were also converted in the same way between 1885 and 1887. The six sister machines with the 2-2-2 wheel arrangement had already been converted to the same form in 1882, with no part remaining the same apart from the front frame section. A final rebuild of all machines took place between 1893 and 1905, using a new boiler with a raised firebox top.

Variantas builtrebuilt 1879rebuilt 1893
General
Built18621879-18811893-1905
ManufacturerBeyer, Peacock & Co.
Axle config2-4-0 (Porter) 2-4-0T (Porter) 2-4-0 (Porter) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase14 ft 4 in17 ft16 ft 6 in
Fixed wheelbase14 ft 4 in17 ft16 ft 6 in
Empty weight68,992 lbs
Service weight64,064 lbs75,712 lbs
Adhesive weight42,336 lbs49,952 lbs
Axle load21,168 lbs27,552 lbs
Water capacity1,201 us gal
Fuel capacitycoal
Power
Power sourcesteam
Estimated power400 hp (298 kW)500 hp (373 kW)600 hp (447 kW)
Optimal speed34 mph
Starting effort11,154 lbf
Power Plant
Driver diameter72 in74 in
Boiler pressure140 psi
Expansion typesimple
Cylinderstwo, 16 x 20 intwo, 17 x 24 in
Boiler
Firebox area90 sq ft99 sq ft102 sq ft
Tube heating area945 sq ft1,198 sq ft1,179 sq ft
Evaporative heating area1,035 sq ft1,297 sq ft1,281 sq ft
Total heating area1,035 sq ft1,297 sq ft1,281 sq ft
Calculated Values
steam locomotive
express
tank locomotive
last changed: 03/2023
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