class class normally referred norwegian class built oslo oslo norway aluminium operate oslo operate street lines contemporary modern electronic equipment streamlined shape comfortable accommodation till faster norwegian suburban prototype delivered different motor solutions vickers particularly successful serial production conventional motors delivered class oslo mainly services remaining class leased lines later line oslo transferred remained use class involved fatal incidents including fire prototype nos remain whilst kept converted maintenance vehicles nos painted yellow stripes kept veteran background 1930s oslo operated fleet trailers latest series class delivered early 1920s late 1930s old fashioned low speed uncomfortable interiors axle wheel arrangement increased competition cars buses company start process find new generation buses agreement build series aluminium buses order tracks farther operate metres wide metres long use aluminium body controversial international experts recommended company choose solution goal decrease weight operate powerful motors giving lower cost prototype scale model built disused construction delivered prototypes oslo slightly different specifications numbered main types prototypes later designated motors vickers motors motors motors taken use february line capable mph compared maximum mph possible older according tests specialist high speed construction afford power reduction low speed mph shortly taken use lost braking power killing person landed pavement initial plan use operate services line vehicle reserve possible service vehicles estimated units ordered license built experimental configurations fitted prototype work instead conventional motor solution chosen serial units equipped brakes series received motors electrical equipment different series electrical equipment street operation suburban equipped electrical equipment vickers series delivered february june leased oslo subsidiary gave designation class service line end stations far outside oslo city limits time partially ran relatively rural landscape norwegian line called oslo numbered numbered body streamlined tail end look like nicknamed norwegian term later common term class operation world war petroleum gave boost electric handle massive increase equipped single centre door solution worked war bottle neck packed riders lack parts particularly british vickers motors caused long waits vehicles depots line transferred terminate city centre class operated west sent germany city lacked balloon loops wide end war oslo decided transfer remaining high speed suited light rail centre door reduced capacity order series gave oslo sufficient stock operate street lines company transferred given designation class bad condition line retired october caught fire taken service august people perished injured fire worst disaster history class transferred parts instead tied east city started operating service bus route converted man operation conductor replaced ticket selling started process converting fleet converted trial remaining converted delivered single door cost converting little single manning highly profitable retired lost braking power crashed selected given following delivery articulated class gradually retired running kept oslo kept converted maintenance vehicles painted yellow stripes specifications built self contained aluminium bodies gave light body strong steel giving time regarded elastic structure break easy resulted bodies sinking somewhat ends caused accidents increasing costs repairs bodies meters long meters wide centre beam steel intended compensate soft aluminium structure prone needed repeated replacement bodies streamlined shape distinct tail addition aesthetic purpose chosen strengthened structure vehicle tested wind tunnel single door double door middle right class single door rear originally delivered apartments wall inside door centre door removed smoke free partial wooden interior floors renovations changed usually variations brown yellow originally light replaced lamps rebuilt remove conductor driver given space purse ticket machine announcement system series eventually rear door taken use blocked extra seat attached steel aluminium body attached leaf springs frames axle box joint spiral spring motors controlling axle equipped different spring system allowed remain height independent weight class equipped disc brakes class equipped drum brakes equipped rail brakes dynamic brakes serial production models equipped motors gave maximum speed mph built serial motors connected parallel serial motors motor prototypes equipped vickers motors compound motor brakes sixteen regulating complicated operate technology previously birmingham company discontinued quickly complexity complicated set reason fatal accident brakes removed late 1940s motors prone technical failures spent time workshop weighed tonnes long tons short tons equipped motors motor controller electrical equipment run battery charged overhead wire regulated motor controller motors equipped brakes particularly battery charging system defects needed frequent repairs eventually controller brakes removed weighed tonnes long tons short tons equipped motors conventional design brakes eventually removed technical difficulties held record maintenance time weighed tonnes long tons short tons equipped motors powered caused problems required wheels ground regularly avoid uneven driving discovered weighed tonnes long tons short tons
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