Abstract: An improved redirective end treatment is disclosed which uses a braking system that provides a varied braking force to maintain the rate of deceleration of a vehicle impacting the end treatment at or below a predetermined value. The redirective end treatment includes a guardrail structure and an impact sled positioned ahead of the guardrail structure. Pivotally attached to the front of the guardrail structure is a smart braking unit positioned within the impact sled. When a vehicle collides with the impact sled, the sled is caused to translate backwards towards the braking unit and guardrail structure. As the impact sled collides with the braking unit, the guardrail structure is caused to move vertically and fold in a scissors-like action. The amount of linear space finally occupied by the end treatment is then reduced, but because the impact sled, braking unit and guardrail structure are not physically damaged they can be returned to their original positions for reuse.

Abstract: A traction control module for a hydrostatic drive that has a hydraulic pump which drives at least two hydraulic wheel motors in a parallel closed looped configuration with each wheel motor. The traction control has a branch flow path that is in parallel with a main flow path. A dynamically balanced slidable valve acts between the main and the branch flow paths to control fluid flow to the associated wheel motor. When the load on one of the wheels is partially, but not entirely lost, the slidable valve reacts to maintain system pressure at substantially its preexisting level.

Abstract: The railroad power switch operates from the energy stored in a hydraulic accumulator. A pump charges the accumulator and keeps it charged. A power cylinder acts on the moveable rail of a railroad switch through this hydraulic energy. The energy opens the switch, closes it, and stabilizes it during train trailing through the switch. A spring pack supplements this hydraulic energy in stabilizing the switch.