A road train, land train or long combination vehicle is a trucking vehicle used to move road freight more efficiently than semi-trailer trucks.
It consists of two or more trailers or semi-trailers hauled by a prime mover. Early road trains consisted of traction engines pulling multiple wagons. The first identified road trains operated into South Australia's Flinders Ranges
from the Port Augusta area in the mid-19th century. They displaced bullock teams for the carriage of minerals to port and were, in turn, superseded by railways.