What is "trail car"

Trailer \Trail"er\, n.

1. a wheeled vehicle without a motor, designed to be drawn by a motor vehicle in front of it; specifically:

   1. such a vehicle used on street railroads. Called also trail car.

   2. the large wheeled wagon or van pulled by a tractor in a tractor-trailer combination.

   3. a vehicle equipped as a mobile dwelling unit, pulled by an automobile or other mtor vehicle, and used as a dwelling when parked; -- also called a mobile home.

   4. A wheeled motorless open wagon designed to carry a heavy object, such as a boat trailer.

2. (Movies) A short blank segment of movie film attached to the end; -- used for convenient insertion of the film in a projector.

3. (Movies) A short film consisting primarily of one or more short portions of a film, used in promotions or advertisements shortly before initial release of a film.

4. A part of an object which extends some distance beyond the main body of the object; as, the trailer of a plant.

   trailer park. An area equipped to accommodate trailers[2], often with outlets supplying electrical power and water. Called also trailer camp, trailer court.