semi-trailer means any trailer designed to be coupled to a motor vehicle in such a way that part of it rests on the motor vehicle and that a substantial part of its mass and the mass of its load is borne by the motor vehicle;
Camping trailer means every vehicle that has collapsible sides and contains sleeping quarters but
Travel trailer means a vehicle:
Railroad train means a steam engine or an electric or other motor, with or without cars coupled thereto, operated by a railroad.
Travel training means providing instruction, as appropriate, to children with significant cognitive disabilities, and any other children with disabilities who require this instruction, to enable them to develop an awareness of the environment in which they live, and learn the skills necessary to move effectively and safely from place to place within that environment (e.g., in school, in the home, at work, and in the community).