Trailer train

The assembly has a wheel base (1) equipped with a swinging drawbar, and a fixed and short complementary unit formed of ball hook (12) and a sphere (13) at ends. The base is attached to a carriage by one of the ends. An attachment unit attaches the base to a carriage, and is formed by a fixed unit formed of the hook, the sphere and a housing (16). The housing is carried by an end of a lever (14) mounted at an axle (15) to tilt between a top release position of the fixed unit and a low position in which the fixed unit cooperates with the housing for attachment of the base to the carriage.