trackless train; land train
A tourist or amusement vehicle consisting of a motorized unit pulling several passenger trailers, often seen in parks or resorts. Not a road-going truck combination.
I rode the trackless train at the amusement park.
road train; long combination vehicle
A heavy truck pulling multiple trailers, used for long-distance freight, especially in Australia. This sense is less common in everyday Japanese.
In Australia, road trains are used for long-distance transport.