london underground stock locomotives london underground consist vehicles number types engineering purposes include battery locomotives diesel locomotives electric locomotives locomotives pilot motor cars ballast motor cars details types covered pilot motor cars ballast motor cars generally vehicles withdrawn passenger service continue engineering department pilot motor cars vehicles system ballast motor cars haul ballast trains engineering trains ballast motor cars trailer cars built converted motor cars trials multiple system britain retained use followed french stock cars built converted 1920s 1930s batch consisted standard stock cars converted rolling stock reorganisation replacement 1970s district metropolitan lines resulted number surface stock cars pilot motor duties subsequently motor cars stock stock purpose complete car units stock london underground owned self powered vehicles designed duties include tunnel cleaning train consisting stock motor cars purpose built cars act like giant vacuum cleaner hold tons dust filter tanks need emptied track machines purchased road rail vehicles obtained use depot early ballast motor cars opened electric locomotives hauling car trains locomotives weighed tons largely causing severe vibration problems properties near line effort resolve problem coaches fitted motors trial britain multiple unit control system trials success multiple unit trains running trial cars numbers retained ballast motor cars work underground worked form batteries fitted renumbered scrapped batch ballast motor cars french built gate stock cars originally constructed converted early 1920s run air door stock motor cars converted replaced modern cars displaced cars scrapped kept ballast motor cars numbers service fleet final converted run single cars shuttle second world war pilot motor cars trains line supplied food people sleeping stations escape bombing city returned shuttle pilot motor cars transferring cars engineering works depots coupled flat wagon period transfer stores depot took stores queens park depots line hungarian built gate stock motor cars ballast motor cars numbered final stored hope restored preserved project appeared costly gate end car cut rest scrapped refurbishment gate displayed hungarian motor cars line pilot motor cars reconstruction line numbered spur line line station opened march easier transfer ballast motor cars lines vehicles operational continued time age maintenance difficult replaced years scrapped standard stock cars fourteen standard stock motor cars withdrawn passenger service converted ballast motor cars final completed early vehicles chosen built chosen repairs collision damage numbered painted grey metropolitan scrapped collision time standard stock withdrawn replaced stock repair replaced motor car replacement carried number motor car replace badly damaged case carried new number 1970s ballast motor cars gradually withdrawn performed leaf clearing duties late scrapped september single passenger cars moved system depots movements necessary standard stock motor cars borrowed passenger fleet normally following introduction passenger stock single cars parts units moved frequently normal passenger motor cars perform task equipment needed operate spread unit confined motor car motor cars dating allocated pilot motor cars painted numbered ballast motor fleet withdrawn performing work following withdrawal shipped replace car island line damaged remaining cars worked pairs working pilot motor cars withdrawn surface stock cars time time underground needed surface stock cars system motor cars set aside pilot motor cars purpose trains district line rearranged car units district line stock removed line resulted large number spare cars transferred eventual scrapping stock motor car stock motor car allocated pilot motor cars task receive numbers toured system car check joined stock motor cars renumbered scrap cars new stock delivered handled pilot motor cars drawn stock scrapped final painted yellow subsequently red numbers replaced original passenger car numbers following withdrawal retained delivery stock began pairs stock motor cars pilot motor cars new stock marshall scrap stock displaced new units stock driven power commissioned stock different delivery commissioning took place pilot motor cars needed transfer stock pairs stock motor cars allocated pairs joining new trains transferred pilot motor car end trains withdrawn scrapping pilot motor cars carried large ends accidentally scrapped duties complete pairs stock motor cars pilot motor cars stock scrapped surface stock pilot motor cars scrapped deliveries complete stock cars privately preserved tube stock cars deliveries stock enabled stock withdrawn cars converted use ballast motor cars task complicated earlier stock units mounted trailer cars motor cars fitted changed type numbered conversion carried converted final numbered converted additionally fitted killing equipment added year numbered ballast motor cars normally worked pairs engineering trains ballast motor car end battery locomotive advantage ballast motor cars battery locomotives interiors personnel storing small tools powerful work traction current switched killing pair withdrawn stock cars converted work pilot motor cars conversion carried works derby numbered haul track recording car system recording car numbered converted built trailer car cars stock supplemented cars stock retained stock withdrawn formed seven car units pilot motor units remaining cars training emergency response unit units fitted equipment allow work central line based owned seventh unit stored waiting disposal units renumbered engineering series continued carry passenger fleet numbers driving motor cars based olive green self powered vehicles owned small number vehicles ballast motor pilot motor cars district line killing train initially consisting built stock driving motor car control trailer cars kept common depot control trailer scrapped replaced second motor car provide power killing duties carried second world war vehicles refurbished subsequently scrapped tunnel cleaning train completed consisted driving motor cars purpose built vehicles middle vehicle contains fan unit supplies large volumes low pressure air series dust tunnel walls track cars draw dust laden air filter chambers fitted dust depots enable train operate sufficiently slowly cleaning process effective hydraulic drive fitted motor cars settings allow speeds mph mph mph mph tons dust held filter bags units fitted carbon dioxide water mist fire fighting equipment nature fine dust particles problems train began work resolved company owned track maintenance machines built fitted equipment allow work central line previously owned machines acquired model scrapped oldest withdrawn machines built went built acquired london underground purchased road rail vehicles depot fitted small railway wheels outside road tyres lowered working railway mode ensure road wheels run rails numbered previously owned tractor trailer pair vehicles purchased leaf clearing duties tractor unit suck leaves stored cubic foot mounted trailer
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