Pib roj teeb: feem ntau yog siv rau kev pib thiab teeb pom kev ntawm tsheb, maus taus, tsheb laij teb, diesel xyaw, thiab lwm yam;
Fixed roj teeb: tsuas yog siv rau kev sib txuas lus, fais fab nroj tsuag thiab lub computer system raws li lub hwj chim backup rau kev tiv thaiv thiab tsis siv neeg tswj;
Traction roj teeb: tsuas yog siv rau lub zog ntawm ntau lub tsheb roj teeb, forklifts, forklifts, thiab lwm yam;
Railway roj teeb: feem ntau yog siv rau kev pib thiab teeb pom kev zoo ntawm railway diesel locomotives, hluav taws xob locomotives thiab cov neeg nrog caij tsheb.
