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London & South Western class F13
Great Britain | 1905 | 5 produced
No. 330
No. 330
J.R. Howden, The Boys' Book of Locomotives

The London and South Western Railway made the jump from the 4-4-0 locomotive to the 4-6-0 in 1905 with the F13 class. The trigger for this were the so-called “boat trains”, which had to bring a constantly growing number of passengers with ever faster schedules to the ships on the English Channel coast. Since use was only to be expected on main lines, the designer Dugald Drummond hardly had to comply with any axle load restrictions. Due to the increased number of axles and the greater overall length, a significantly more powerful boiler than on previous locomotives was possible. In order to exploit its capacity, a simple-acting four-cylinder engine was used. Up to this point in time, engines with four cylinders were mostly only used in compound locomotives. Since the LSWR did not use water troughs to fill up during the journey, four-axle tenders with a correspondingly large capacity were used.

Schematic drawing with dimensions
Schematic drawing with dimensions
Locomotive Magazine, March 1921

Only five examples were built in 1905 in the LSWR workshops in London's Nine Elms. Although these locomotives looked very simple on the outside, the running gear was overly complex. The outside cylinders had Walschaerts-type valve gear, while the inside ones were controlled by their own Stephenson-type valve gear. The service with the boat trains between Salisbury and Exeter lasted only one year and was then discontinued. They were now repurposed as freight locomotives and henceforth had to haul coal trains between Salisbury and Southampton. One locomotive was fitted with the Eastleigh superheater introduced on the H15 in 1920, but this did not quite make up for the general weaknesses of the class. Eventually, all five F13s were rebuilt to H15s starting in 1924.

Variantas builtsuperheated
ManufacturerNine Elms
Axle config4-6-0 (Ten-wheeler) 
Gauge4 ft 8 1/2 in (Standard gauge)
Dimensions and Weights
Length63 ft 10 15/16 in
Wheelbase26 ft 10 in
Fixed wheelbase13 ft 4 in
Total wheelbase53 ft 2 in
Empty weight151,984 lbs
Service weight163,520 lbs165,536 lbs
Adhesive weight115,360 lbs118,272 lbs
Total weight263,983 lbs266,000 lbs
Axle load41,440 lbs
Water capacity6,966 us gal
Fuel capacity11,200 lbs (coal)
Power sourcesteam
Estimated power1,400 hp (1,044 kW)1,450 hp (1,081 kW)
Optimal speed35 mph36 mph
Starting effort25,387 lbf
Power Plant
Driver diameter72 in
Boiler pressure175 psi
Expansion typesimple
Cylindersfour, 16 x 24 in
Grate area31.5 sq ft
Firebox area517 sq ft168 sq ft
Tube heating area2,210 sq ft1,716 sq ft
Evaporative heating area2,727 sq ft1,884 sq ft
Superheater area308 sq ft
Total heating area2,727 sq ft2,192 sq ft
Calculated Values
steam locomotive
Dugald Drummond
last changed: 04/2022

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