class class steam locomotives designed passenger duties class represented penultimate stage development southern railway family improved basic principles established chief mechanical engineer locomotives class design drew experience classes improved applying midland railway ideas design enabling influence development britain class designed production time obsolete locomotives withdrawn derived earlier river class tank locomotives members class class locomotives involved railway accident class locomotives built fill gap cross country semi fast express passenger services withdrawal class design continued locomotive fleet parts designed designed classes total locomotives built design formed basis cylinder class able operate network gaining nickname boats submarine warfare world war continued operate british railways class saw continuous use members class withdrawn service class locomotives preserved heritage railways south england background history class complex linked fate cylinder river class tank locomotives design work new passenger driving wheels complete involvement class locomotive rail crash presented opportunity bring forward construction class class tank engines passenger counterpart class mixed traffic design noted rough riding laid track class withdrawn service inquiry followed determined rough riding contributed crash recommendation class rebuilt tender locomotives tried tested features assistant engineer class class principles applied class design aided mass production incorporated features found class locomotives designed order second batch class locomotives delayed specification revised construct class locomotives intended replace elderly classes running fleet attempted ease maintenance locomotives sharing parts designs style new locomotive reflected midland railway influence assistants engineer addition tender increased operating range class class predecessors wheel arrangement applied class locomotives improved locomotive stability operational construction details class rebuilding programme followed class river began works june work involved converting tank engine tender locomotive included removal water tanks rear coal bunker trailing driving wheels right hand drive class type boiler retained aesthetic aspects inherited class midland railway engineer contributions design creating simple functional locomotive similar class rebuilt locomotives given tender designed cab bore strong resemblance featured designs designs tender straight sided imperial gallons variety larger imperial design later class inward sloping prevent coal rebuild river class locomotive service march months production locomotive construction brighton rapid turnaround achieved design work place rebuilding existing locomotives cheaper building scratch performance trials prior work commencing rebuilding rest class works lost names bad publicity attached river class crash heavily damaged member class rebuilt class configuration december unique cylinder river tank class river rebuilt general class specification prototype cylinder class derivative june production batch differences rebuilt locomotives construction delayed order class locomotives began alteration class specification result position assistants new builds displayed class influence ideas applied class class including long travel fast running conical boilers constructed glasgow production batch emerged brighton works august featured tapered chimney class locomotives locomotives production batch split equally brighton works completed december production locomotives slightly different profile class featured left hand drive improve visibility signals driver higher running plates sides boiler required smaller wheel cover tops driving wheels variation dome covers retained high class type class common class locomotives midland railway influence showed placement locomotive fittings production batch water feed boiler located inside dome whilst cab area modified version class midland railway style double spectacle plates small windows face cab left class production versions boiler modifications typical southern railway attempt produce fleet locomotives members class vary practice surface area increased equipped outside valve gear second production batch modifications second batch new build class locomotives constructed february obsolete locomotives withdrawn service brought total new build locomotives total number operational class engines new batch featured detail differences rest class arrangement footsteps locomotive continued use standard left hand drive cab layout improve driver forward vision cab smoke fitted class prevent drifting smoke forward vision applied class removed successor fitted class chimneys improve operational details class reliable economical design capable attaining speeds excess mph result fitted long travel high capacity tapered boilers promoted free steaming driving wheels allowed fast running long distances distributed widely class counterparts operating class size cylinders cab meant class gauge hastings line inadequate tunnels route nature earned nickname boats crews praised abilities achieve designed operating department undertook trials improve fleet efficiency built based fitted experimental fuel german design experiment terminated minor explosion caused coal coming contact sparks thrown experiment proved coal false economy fine dust chimney taking place locomotive returned normal coal burning class test bed government backed scheme arrangements anticipation coal shortage class nos converted oil burning set follow suit project abandoned oil reverted coal firing place members class entered british railways service class received chimneys british railways standard class variety replacement cylinders worn intensive use members class given replacement frames overhaul shallower curve beam early 1960s withdrawal class designed saw class replacing services west exeter large wheels offered little advantage characterised railway network favoured form motive power west exeter smaller wheeled class heavier passenger work allocated weight restrictions imposed area class represented glamorous classes passenger locomotive fact mainly mixed traffic secondary passenger duties withdrawal class withdrawn accidents incidents passenger train park london coming rest foul adjacent line locomotive hauling passenger train long collision people killed injured cause accident failure implement speed restriction section track maintenance november carriages left foul adjacent line station hampshire locomotive collided person injured november locomotive hampshire preservation unusually surviving steamed point preservation survivors worked mainline numbering entire class painted lined southern railway olive green yellow markings southern tender second world war class painted wartime black sunshine yellow lettering later painted lined green class initially numbered post grouping system class production numbering system denotes locomotive design originated southern numbering policy eventually final batch locomotives built numbered prefix class locomotives subsequently renumbered time british railways entire class absorbed british railways given power classification denoting mixed traffic locomotive initially similar british railways tender prefix southern number succeeded british railways mixed traffic lined black red cream grey lining british railways crest tender british railways standard numbering system replace system class allocated series class rest
SR U class