class class class passenger tank locomotive built class designed use intensive london network london performed tasks utility built class went modifications production reason detail variations frame length class fitted push pull operation gear enabled efficient use branch line duties need change end train end journey ownership successful suburban passenger engines increased availability newer standard designs class new role reliable branch line engines especially members class lasted service examples survived preservation number railway background designed locomotives answer need larger powerful version class adams design wheels developed meet requirement compact sure suburban passenger locomotive utilised intensive commuter london suburban services london growing rate began use older classes locomotive construction history tank locomotive design replacing locomotive superintendent sloping increased area giving greater power drew previous experience successful class whilst works manager brighton early 1870s class scotland heaviest type run britain constructed march november class long production run major sets design variants locomotives constructed short combined type added conical opposed flat door implemented numbers design modified incorporate inside later relocated running plate frame longer end introduced steam reversing gear fitted sources record locomotives class designation refer longer framed versions purposes sub classes grouped known construction batch moved new items feed water heating single ram pumps balanced remainder construction locomotive pumps fitted successful features class designs boiler cylinders motion identical class freight locomotives boiler passenger class boiler pressure according bradley original lbf working pressure reduced lbf reduce wear boilers clear longer sustained high speed running states pressure increased pounds force square inch push pull equipment thirty locomotives equipped push pull train capabilities provision primitive cable device modification designed save time country branch lines locomotive usually run train order return journey result possible driver drive train cab located designated push pull coach leaving tend fire operate locomotive system eventually deemed unsafe instances delayed reaction result replaced engines safer compressed air system system seen previous successful use air required extra space installation conversions confined long framed members class conversions push pull capability appeared result short framed having long frames substituted overhaul order create room air variants following successful use classes fitted boiler december extended larger cylinders additional weight new boiler raised centre gravity locomotive adding problems instability faster main line trains whilst simultaneously preventing use branch lines result examples fitted eventually broken spare parts fitted equipment adopted equipment later removed operational details introduced class allocated work semi fast passenger services london portsmouth exeter plymouth withdrawn duties high speed near following criticism inspector use coupled locomotives fast services result class synonymous local main line branch workings london suburban services gradual growth electrification inner london suburban lines class tended stopping trains main line services reading formation class gradually began notably west england branch lines kent south eastern chatham railway line reading 1950s substantial number push pull fitted members class transferred central section southern region brighton replacing worn locomotives branch lines transferred bridges use branches accepted train crews preferred powerful class remained london area stock workings notably station class gradually replaced southeast england late 1950s early 1960s introduction electrification new lightweight standard steam classes diesel diesel electric multiple units end majority remained based work branch accidents incidents locomotive hauling passenger train park london coming rest foul adjacent line passenger train long collision people killed injured accident caused failure implement speed restriction section track maintenance november locomotive hampshire moved person withdrawal preservation apart entered british railways service year fell lift shaft provided rolling stock access city line cut remainder survived seven years remainder class withdrawn plan examples class steam locomotive survived preservation built york surviving records indicate number constructed cost lasted service built based railway locomotive sold vermont united_states_of_america repatriated numbering class saw pre grouping career associated class period passenger light sage green purple brown creating panels green lined white black water tank sides locomotive number coal bunker sides chosen non typical green transferred ownership locomotives darker version numbering having prefix denote prevent confusion locomotives number inherited southern constituent railways denoting south eastern chatham railway locomotives brighton london brighton dropped locomotives remainder renumbered lettering changed yellow southern water tank sides black white lining appointment chief mechanical engineer southern policy changed green passenger locomotives lettering tank sides lined yellow black solid black numbers lost prefix war years locomotives wartime black overhaul class retained numbering depended batch locomotive belonged batch allocated series class given power classification remained southern lined painted soon numbers british railways sunshine yellow style sides tanks eventually replaced lined mixed traffic black numbering initially southern period prefix added number replaced standard numbering system locomotives allocated batch numbers series models railways manufacture model gauge manufactured model gauge ended production model
LSWR M7 class