horsebox

Noun

 * 1)  A motor vehicle for transporting horses.
 * 2) A container for transporting horses in, whether by road, rail, or sea.
 * 3)  A van-type railway vehicle specially built for the carriage of horses.

Usage notes
Unlike US horse trailers, horseboxes are rather small, but there are large horseboxes, coachbuilt on lorry chassis, mainly for carrying racehorses and police horses. Horse trailers may be quite large, transporting a large number of horses.

Translations

 * French:
 * Italian: