Abstract: A vertically displaceable rigid cover for a truck bed is connected to the truck bed by many of pair of linkages on each side of the truck bed. A fluid pressure actuated cylinder is associated with each linkage for lifting and lowering the rigid cover, and for causing a portion of each linkage to be received into and continuously urged against a vertical stop means mounted on the truck bed.

Abstract: A railway freight car adapted particularly for transporting coal or like granular materials where a flexible cover is adapted to be draped over the materials so as to protect them from the elements when the car is being transported from one place to another. In the transport of coal in particular, there are several problems presented if the coal is left uncovered during transport. First, there is the problem of coal dust particles flying in the surrounding atmosphere due to the aspiration of the coal dust during travel of the car especially when the car is travelling at a high rate of speed. Then of course, there is always the wind to be considered if the coal is left uncovered and here again you have coal dust particles being blown away from the coal and this dust is scattered into the surrounding atmosphere causing a pollution problem.