Inkoliso yoololiwe zitsalwa ngeegutsi ezaziwa ngokuba zii-locomotives ngesiNgesi. Phambi ko-1900, phantse bonke babeziigutsi ezihamba ngamalahle ezaziwa ngokuba zii-steam locomotives ngesiNgesi. Njengoko olu hlobo lwenjini yamalahle lusebenzisa amafutha amaninzi ngomsebenzi oluwenzayo, ithi ke ngoko ikhuphe iinqwelo ezihamba nge-disile nakwiinqwelo kunye nee-nqwelo ezihamba ngombane, ngeminyaka yoo-1930s. Namhlanje, uninzi lweenqwelo ezirhuqwayo zeze-diesel-nombane.