Railway occurrences are to be categorized as follows:
(a) Collisions and derailments.
(b) Unauthorised movements.
(c) Level crossings.
(d) Persons struck during shunting or train movements.
(e) People and train related.
(f) People and station related.
(g) Electrical shock.
(h) Dangerous goods.
(i) Fires.
(j) Security related.
(k) Crowd related.
(l) Labour unrest.