8 Ill. Adm. Code 215.250
Tank Car Loading and Unloading Points and Operations
Section 215
Section 215.250 Tank Car
Loading and Unloading Points and Operations
a) A sign reading, "Stop – Tank Car Connected" or
"Stop – Men at Work," shall be displayed at the active end or ends of
the siding while the car is connected for loading or unloading.
b) While tank cars are on siding for loading or unloading, the
wheels at both ends shall be blocked on the rails.
c) Tank car loading or unloading site shall be substantially
level.