Locomotives of SR Design
With the heavy emphasis on electrification for the London Suburban area and the Brighton main line there was little need for new steam locomotive designs. The main steam tasks were boat trains (Dover, Folkestone and Newhaven), West of England, Kent services and freight. When designing steam locomotives, the designers had some interesting constraints that dictated where the locomotive could be used. Due to the hangover from SE&CR days, most of the lines in Kent were of fairly light construction and would not take the weight of a modern express locomotive until well into the 1930s. Hence the extensive rebuilding (and new construction) of 4-4-0 designs at a time when other lines were busily building pacifics or heavy 4-6-0s.
The ex-SER lines also had the problem of the narrow Mountfield and Wadhurst tunnels on the Hastings Line, requiring locomotive and rolling stock rather narrower than permitted elsewhere. This problem persisted into British Railways days until eventually the tunnels were single tracked, giving clearance for normal stock.
Services for west of Southampton and Salisbury had a different set of problems as neither the Southern Railway nor its constituents installed water troughs, thus leading to large tenders with greater water capacity than those fitted to similar locomotives on other railways.
New designs were:
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