Railway accidents

[PJW]

Picking recent (living memory) accidents is not always a good technique. Picking something more obscure forces focus.

Alternatively, pick something that is very recent that you know about but perhaps the examiner's don't.  If I were doing the exam this year I'd have picked the collision at Waterloo between the passenger train and the engineering train whilst the area was being relaid and the signaling amended.....

It often isn't the accidents with a large number of casualties that are best for learning lessons; those that by luck have much more minor consequences or are "incidents" rather than "accidents" happen far more frequently, get less publicity but are just as important since in other circumstances could have ended far differently.