OSHA Regulations For Signs
Signs & Lights
1910.261(c) …
(9) Traffic warning signs or signals. The blue flag policy shall be used to mark stationary cars day and night. This policy shall include marking the track in advance of the spotted cars (flag for daytime, light for darkness).
(ii) After cars are spotted for loading or unloading, warning flags or signs shall be placed in the center of the track at least 50 feet away from the cars and a derail set to protect workmen in the car.
Loading Tank Cars
1910.111(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 siding and shall be left up until after the car is unloaded and disconnected from discharge connections. Signs shall be of metal or other suilable 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 dockboards or bridge plates are in position.
1910.178(m) …
(7) Brakes shall be set and wheel blocks shall be in place to prevent movement of trucks, trailers, or railroad cars while loading or unloading.
1910.30(a) …
(5) Positive protection shall be provided to prevent railroad cars from being moved while dockboards 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.