4.7.2.2.(1)

Intent 1:

To limit the probability that normal train operations will lead to excessive vibrations or ground settling, which could lead to the failure of the tank, which could lead to the escape of liquid, which could lead to harm to the public.

Intent 2:

To limit the probability that a train derailment will lead to impact with or damage to the tank, which could lead to the failure of the tank, which could lead to the escape of liquid, which could lead to harm to the public.