Abstract: A coupling arrangement for forming a train of highway trailers, including at least one leading trailer having a rearwardly disposed locating device and a retractable highway wheel assembly, at least one following trailer having a forwardly disposed locating device and a retractable highway wheel assembly, a coupler removably and pivotally mounted upon a railway bogie and including a forwardly projecting coupling device and a rearwardly disposed coupling device, the former coupling device engageable with the leading trailer's rearwardly disposed locating device and the latter coupling device engageable with the following trailer's forwardly disposed locating device. Upon engagement of the respective coupling and locating devices the forwardly projecting coupling device forms a generally rigid beam from the rear of the leading trailer to the interface between the coupler and the bogie.