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Bristol & Exeter Pearson 9 feet 4-2-4T
Great Britain | 1853 | 8 produced
No. 44
No. 44
Stadtarchiv Maynz / BPSF 9849 A

The broad gauge Bristol & Exeter Railway took over the “Flying Dutchman”, which started from London-Paddington, on the last section between Bristol and Exeter. To accommodate this fastest train in the world, eight tank locomotives with a driving wheel diameter of nine feet or 2,743 mm were ordered from Rothwell & Co. These were the largest wheels ever found on a commercially used locomotive.

There was a bogie at each end of the locomotives, while the driving wheels had no flanges. The load on the bogies was lower than that on the driving axle. Another feature was the outside frame, which ran from front to back and in which the driving axle was also mounted. They often reached speeds of around 80 mph (129 km/h), with the highest recorded speed on a slight decent reaching 81.8 mph

After the rebuild to 8 ft 10 in
After the rebuild to 8 ft 10 in
Locomotive Magazine, October 1898

After a derailment in 1876, the remaining seven locomotives were rebuilt. They received driving wheels with a diameter of only eight feet and ten inches, which now had flanges. In addition, the outside frame was eliminated and there was now a longer overall wheelbase. Furthermore, the cylinders were now larger and, the larger boiler above all had a larger grate because it now burned coal instead of coke. Three were even converted into tender locomotives with a 4-2-2 wheel arrangement.

Variantas builtrebuilt 8 ft 10 in
General
Built18531876
ManufacturerRothwell & Co.Swindon
Axle config4-2-4T (Huntington) 
Gauge7 ft 0 1/4 in (GWR broad gauge)
Dimensions and Weights
Length33 ft 6 in
Wheelbase24 ft 10 in25 ft 6 in
Fixed wheelbase5 ft 9 in5 ft 6 in
Service weight94,080 lbs111,328 lbs
Adhesive weight41,440 lbs
Axle load41,440 lbs
Water capacity1,717 us gal
Fuel capacity4,480 lbs (coal)
Power
Power sourcesteam
Estimated power350 hp (261 kW)400 hp (298 kW)
Optimal speed36 mph34 mph
Top speed80 mph
Starting effort6,171 lbf7,483 lbf
Power Plant
Driver diameter108 in106 in
Boiler pressure120 psi
Expansion typesimple
Cylinderstwo, 16 1/2 x 24 intwo, 18 x 24 in
Boiler
Grate area125 sq ft23.1 sq ft
Firebox area146 sq ft
Tube heating area1,089 sq ft
Evaporative heating area1,075 sq ft1,235 sq ft
Total heating area1,075 sq ft1,235 sq ft
Calculated Values
steam locomotive
last changed: 01/2024
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