<P> Diesel and electric locomotives started slowly replacing steam in 1950s . The last broad gauge (5' 6 ") steam locomotive built by CLW was a WG class locomotive named Antim Sitara (The last star), #10560, built in June 1970 . The last meter gauge steam locomotive was a YG class built in 1972 . Steam was largely replaced in 1980s . The last scheduled steam operation was on 6 December 1995 on broad gauge . Last steam operation on narrow / meter gauge ended in 1999 . </P> <P> Two heritage lines, the Darjeeling Himalayan railway and the Nilgiri mountain railway have retained steam service . </P>

When did trains change from steam to diesel