The Piston shaker has a wedge-end which fits all standard covered hopper car side brackets. The wedge cannot be clamped down or secured in any other fashion except being lodged in the bracket. Lugs on the wedge keep it from becoming jammed in the bracket.
                3" Dia. Piston - Good for dry, granular, free-flowing materials by PCS-3.
                4" Dia. Piston - Good for sticky, damp materials which cake or congeal by PCS-4.
Piston shakers work like high-speed sledge hammers, noisy but effective, pounding against the wall of the car bin at high frequency to agitate the material inside. Use this shaker only where there are no noise restrictions, vibration duration will be brief, and where easy movement from bin to bin is important. NOTE: The PCS-3 SHAKER can be modified to comply with force and design requirements set for the ACF "center-flow" hopper car, Contact us for details.

Piston-Type Shaker Accessories: Insertion Cart ##4126-05 ... (90 lbs.)
Air Control Package (Pressure regulator, oiler, filter) PCS-3 #4126-03 ... (7 lbs.) PCS-4 #4126-04 ... (7 lbs.)

Loading tank cars
1910.11(b)...
(iii) Caution signs shall be so placed on the track or car as to give necessary warning to persons approaching the car from open end or ends of sliding and shall be left up untill after the car is unloaded and disconnected from discharge connections. Signs shall be of metal or other suitable material, at least 12 by 15 inches in size and bear the words 'STOP-Tank Car Connected' or 'Stop-Men at work,' the word, 'STOP,' being in letters at least 4 inches high and the other words in letters at least 2 inches high.
(iv) The track of a tank car siding shall be substantially level.
(v) Brakes shall be set and wheels blocked on all cars being unloaded.
1910.110(b)(15)...
(iii) While cars are on sidetrack for loading or unloading, the wheels at both ends shall be blocked on the rails.

Freight cars in general
1910.178(K)...
(2) Wheel stops or other recognized positive protection shall be provided to Prevent railroad cars from moving during loading or unloading operations.
(4) Positive protection shall be provided to prevent railroad cars from being moved while dock boards or bridge plates are in position.
(7) Brakes shall be set and wheels blocks shall be in place to prevent movement of trucks, trailers, or railraod cars while loading or unloading.
(5) Positive protection shall be provided to prevent railroad cars from being moved while dock boards or bridge plates are in position.
1910.176...
(f) Rolling railroad cars. Derail and/or bumper blocks shall be provided on spur railroad tracks where a rolling car could contact other cars being worked, enter a building, work or traffic area.