
mav class 242

 idhi hangerian rashtra railvelaku chendina 4-4-4 t aaviri locomotive. kevalam naalugu udaaharanalatoo kuudina oka chinna taragati, avi 1936 mariyu 1939 madhya nirminchabaddaayi. avi kramabaddheekarinchabadina tank locomotivelu kabatti avi chaalaa asaadhaaranamainavi.
design.
modati prapancha yuddham taruvaata hangerian railway paelavamaina sthithilo undhi. 1920la chivaralo mariyu 1930la praarambhamlo mahaa maandyamtho paatu, vaaru itara deshaalalo abhivruddhi chendadamlo venukabadi unnaaru. ayithe 1930la madhya natiki, vegavantamaina express sevaku demand erpadindi. hangerian demand emitante, vegavantamaina express locomotive, design vegamtho, conny track yokka sthithi kaaranamgaa mariyu 4-5 coach railla nadustunna dhooram mariyu railu baruvulu saapekshamgaa takkuvagaa unnanduna, idhi inca chinnadi mariyu telikainadigaa undataaniki saadhyamavutundi. aaa roeju sailini anusarinchi, locomotivenu kramabaddheekarinchaalsi undhi.
4-4-4 t yokka samaroopa chakraala amarika, mukhyamgaa tender kakunda tank locomotivenu upayoginchadam, turn tablepy locomotivenu riverse cheyalsina avasaram lekunda, rendu disalalo adhika vegamtho nadavadaniki anumatinchadaaniki enchukunnaaru. idhi suburban prayaaneekula sevala kosam 1900 naati 2-4-2 t yokka munupati paddhatini anusarinchindi, ayinappatikee vaegamgaa parugettadaaniki veelugaa vaati poney truckulanu bogiilatoe bharti chesaaru. 1930lalooni express locomotivela kosam, idhe vidhamaina drg class 61 maadirigaane, turn tables laeni chinna stationlalo upayoginchadaaniki badulugaa stationlalo turn-arround samayanni tagginchadam dheeni uddesam.
vegavantamaina express kosam naalugu-janta chakraala vadakam eee samayaniki asaadhaaranamainadi, endukante atlantic amarika, adhika-vegam kosam naalugu-chakraala leading bogitho kuudina naalugu-janta tender locomotive, appatike ekkuvagaa pedda pasiphik dwara bharti cheyabadindi. oka minahaayimpu adhe kaalaaniki chendina yuu. ess. "hiyawata", oka 4-4-2. ayithe yuu. ess. track loadinglu ekkuvagaa undevi, mariyu eee locomotive hangerian design kante rettimpu driving axil loading kaligi undhi. idhi andubaatulo unna neeru mariyu indhana saamarthyaanni tagginchinappatikii, avasaramaina saapekshamgaa takkuva paridhi thoo, class 242 tank locomotivga undagaladu. tender baruvunu mariyu pedda indhana saamarthyaanni nivaarinchadam, axil loadingnu marinta tagginchindi. eee perigina vaegaaniki avasaramaina aadhunika lakshanam, mariyu lokomotivlone breaking baruvu lekapovadam, railu antataa nirantara breaking meruguparichindi, naar vyavasthaku kudinchina air breaklu dwara.
saadhaarana hangerian paddhati vale, modati rendu locomotivelu ukku fireboxlatho nirminchabaddaayi. thoorpu european boggu adhika buudida utpattini edurkovataniki, oka rocking grate amarchabadindi. ukkutho pagullu samasya kaaranamgaa taruvaati rendu locomotivelalo raagi fireboxlu amarchabaddayi. rendava prapancha yuddham yokka needa antey 1941 varaku hangari yuddhamloki pravesinchanappatiki, tadupari udaaharanalu nirminchabadaledu, ayinappatikee eee taragati vijayavantamainadigaa pariganinchabadindi.
kramabaddheekarana.
lenner class eah4 maadirigaane, taragati seva antataa daani mottam streamliningnu konasaaginchindi, conny nirvahana kosam nadustunna gerku praapyatanu meruguparachadaaniki takkuva valenslu taruvaata ekkuva tagginchabaddaayi.
seva.
locomotivelu pampinheelo vijayavantamayyaayi mariyu baga panicheesaayi. vaari 120 kimmy/gamm design vegam sulabhamgaa saadhinchabadindi, appudu sevalo unna itara railla kante 20-30 kimmy/gamm vaegamgaa. vaari raid naanhyata mukhyamgaa gurtinchabadindi, rendu disalalo adhika vegamtho mruduvugaa mariyu sthiramgaa undhi. 
berlin-hamberg railway yokka hye-speed running linelapy pareekshalalo, "flying hamberger" seva kosam kooda upayoginchaaru, vaaru saadhinchaaru.
vaari pradhana seva budapest nundi mariyu chinna miscolk-kosais line nundi kooda undedi, idhi vaari boggu saamarthyam paridhiloo undentha chinnadi. taruvaati samvatsaraallo vaaru budapest nundi biharkerez varaku vibhaagamlo heavy orient expressionu laagadaaniki rendu talalu undevaaru.
1961loe, kotta rolling stacknu pareekshinchadaaniki mariyu hangerian aaviri traction kosam vegavantamaina rikaardunu nelakolpadaaniki 242.002 upayoginchabadindi.
parirakshana.
oka udaaharana, 242.001, migili undhi. konni samvatsaraala paatu oka paarkulo sthiramaina pradarsana taruvaata, idhi 2002loe hangerian railway museumlo bhaagamgaa nadustunna kramamlo punaruddharinchabadindi mariyu autsaahikula pratyeka railla kosam upayogamlo undhi.

