Complex sentence: The V class locomotives entered service in 1955 and initially worked heavy coal trains from the Collie area later on they were put on equally heavy freight trains particularly over the Great Southern line from York to Albany.
Split into simpler sentences: The V class locomotives entered service in 1955 and initially worked heavy coal trains from the Collie area. Later they were used on equally heavy freight trains, particularly over the Great Southern line from York to Albany.