class diesel electric locomotives built norwegian state railways class built delivered series based electro motive division equipped engines distinct bulldog nose numbered series series locomotives prime gives power output kilowatts series wheel arrangement series series higher speed lower effort class dominant locomotive lines ordered company services 1950s 1960s initially mainline routes bergen 1960s bergen lines electrified units transferred smaller lines remained service years later planned returning successor units use private operator railways operator sicily class similar class construction diesel locomotive single unit delivered cost efficient steam locomotives non electrified lines decided order steam locomotives bid deliver units based agreed lease single unit trial body mechanical components built motors prime production shipped trial norway sweden tested express train august proved insufficient power causing train minutes late trial unit delivered september test runs scheduled service trondheim october technical faults december grounding error caused locomotive grounded january march unit sent went marketing tour eventually reach turkey locomotive returned norway july numbered service line trials successful higher steam locomotives days row spent single day depot signed agreement delivery locomotives caused public debate domestic supplier offered build similar locomotive cooperation delivery april order completed july march received permission buy locomotives delivery started october completed june order supplemented trains delivery finnish state railways ordered units cancelled political reasons units offered reduced price designated slight specification variation wheel arrangement higher speed units come short production process given specifications units received slightly longer body given numbers leased sent demonstration tour eastern_europe resulted order hungarian state railways upgraded units transferred trondheim increased need hauling forced use units delivery batch units final delivery units operation initial use operate non electrified long distance lines following delivery batch june north north line stock sufficient replace steam locomotives line reduced travel time hour track sufficient permitted axle load second batch units service rest lines necessary upgrades permitted axle load line locomotives use november completed length operated section line electrified february allowed diesel electric locomotives haul trains oslo bergen completed increased need locomotives compensated electrification extended ran previously denied bridges insufficient axle load permits electrified transferred trondheim single unit usually stationed additional deliveries sufficient units terminate steam operations electrified work continued section finished following year allowed locomotives transferred secondary lines final delivery units completion electrification final steam locomotive taken service half 1960s service line line november electrified steam locomotives retired long term plan half lines finished decades operations stable major investments infrastructure closing lines slightly diesel locomotives needed plans order additional fulfilled took delivery supplement older units mainly units predominantly lines continued operate trains april caught fire damage small repaired instead decided aside unit time planned order additional plans hold closed time line regular service closed 1980s started locomotives sweden supplement decision order replace based twice power slightly powerful intended freight trains series service proved technical problems returned units set aside scrapped return forced units service mid-1990s initiated program replace traditional locomotive carriage trains new multiple units led order sixteen class car units mainline routes line supplement board decided november purchase seven diesel multiple units choice fell class units eventually delivered allowed passenger trains lines operated class hauled hauled train ran january delivery class started retire sell november units sold nok market price new private operator purchase raised controversy potential operator offered market price trains year delivery class locomotives order solve problem rent locomotives chosen sell old locomotives market price demanded pay entire purchase price short term rental units sold united_nations service railways units sold operator sicily italy bought unit maintenance painted yellow preserved units operated kept spare parts kept unit reserve station remaining units scrapped aside sold spare units specifications built sweden series locomotives europe technically similar class denmark hungary locomotives powered cylinder engine power output kilowatts horsepower revolutions minute rpm engines power generator feeds motors equipped motors gives effort lbf series pounds force series motors power output kilowatts horsepower maximum speed kilometres hour mph series kilometres hour miles hour series steel bodies metres long longer length series units series locomotives batch originally intended series wheel arrangement series arrangement center wheels millimetres wheel diameter locomotives weight tonnes long tons short tons series tonnes long tons short tons series trains run multiple engines featured bulldog nose locomotive type norway locomotives delivered dark green 1960s changed red delivered units green scheme
NSB Di 3