a loading system for loading vehicles onto a railroad car allows passengers to load their own vehicles . cylindrical rollers are mounted on a loading dock adjacent to the railroad car . the vehicle is driven onto a pallet that is moved laterally toward the railroad car by the rollers . the railroad car has a frame with two levels that can be raised to position each level with the loading dock . a hydraulic ram pushes the pallet with the vehicle onto the frame for loading and pulls them from the frame for unloading .