You fine the parents. The idea being is that the amount of media coverage doing that would create would maybe make people sit up and listen to the fact that railways are not to be messed around with. We should not have to deal with people who mess around with the railways and get hurt as a result and unfortunately it is going to take incidents like this to drive the message home (or so you would hope, although with the Instagram generation it probably won't ).Yes, let's fine a corpse and if she doesn't pay it dig her up and imprison her.
Yes it's sad that a young person has lost their life and it must be heart wrenching for the parents but someone has to take responsibility and any parent that thinks that it's not their responsibility to teach their offspring road/rail safety and then passing the blame for their lack of teaching them that on to someone else is moronic.
The only person who deserves real sympathy is the driver of the train as something happened that will probably traumatise him for life because someone thought playing on the tracks was acceptable.