Sentence 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 the accumulation and subsequent ignition of vapour from a nearby ignition source, which could lead to harm to persons.

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 the accumulation and subsequent ignition of vapour from a nearby ignition source, which could lead to harm to persons.

Intent 3:

To limit the probability that a fire involving railway cars will spread to the storage tanks, which could lead to harm to persons nearby.

Intent 4:

To limit the probability that a fire involving the storage tanks will spread to the railway cars, which could lead to harm to persons nearby.