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Great Western Railway class 3700 “City”
Great Britain | 1902 | 20 produced
No. 3440 “City of Truro” at Railfest 2012 in York
No. 3440 “City of Truro” at Railfest 2012 in York
Tony Hisgett / City of Truro Railfest 2012

In 1902, the GWR rebuilt a 4-4-0 Atbara class locomotive with a new domeless taper boiler with Belpaire firebox. This was No. 3405 “Mauritius”, which now served as a prototype for the new City class. Ten more of this type were built in 1903 with numbers 3433 to 3442. In 1907 and 1908, nine more Atbaras were rebuilt, bringing the number of the City class to 20. Soon they were given the numbers 3700 to 3719.

No. 3440 “City of Truro”, which later became 3717 and is considered the first steam locomotive to actually reach 100 mph or 161 km/h, achieved greater fame. This happened on the ninth of May 1904 on the Wellington Bank in Somerset, which had a gradient of 1 in 90. However, due to the inaccuracies of the measurement methods at the time, it is still not entirely clear whether the speed achieved was up to 102.3 or even just 99 mph

Between 1910 and 1912 all members of the City class received a superheater. Further modifications carried out over the years included the boiler feed, chimney, valves, a steam reverser and a different bogie. All machines were withdrawn between October 1927 and May 1931. Due to its history, the “City of Truro” is the only one that has been preserved and is now no longer operational.

Variantas builtsuperheated
General
Built1902-19091910
ManufacturerSwindon
Axle config4-4-0 (American) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Wheelbase21 ft 6 in
Fixed wheelbase8 ft 6 in
Service weight123,872 lbs
Adhesive weight80,864 lbs
Total weight206,192 lbs
Axle load41,000 lbs
Water capacity4,323 us gal
Fuel capacity11,200 lbs (coal)
Power
Power sourcesteam
Estimated power850 hp (634 kW)1,050 hp (783 kW)
Optimal speed31 mph39 mph
Starting effort17,345 lbf
Power Plant
Driver diameter80.5 in
Boiler pressure195 psi
Expansion typesimple
Cylinderstwo, 18 x 26 in
Boiler
Grate area20.6 sq ft
Firebox area128.3 sq ft128.7 sq ft
Tube heating area1,621.7 sq ft1,349.3 sq ft
Evaporative heating area1,750 sq ft1,478 sq ft
Superheater area192 sq ft
Total heating area1,750 sq ft1,670 sq ft
Calculated Values
steam locomotive
express
last changed: 12/2023
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