I just read an article about the Indonesian railways, where they put low hanging concrete balls above railroad tracks to deter train rooftop riders.

Roof riding is common on certain trains in Indonesia, but it is illegal.

In Burma people also did it, but they wouldn't let us go up on the roof. What about India?

It was also popular on the tourist trains in Ecuador, but after two people cut their heads off a while ago, they are now very strict about this.

So are there any trains where you are actually allowed to ride on the roof? And how dangerous is it assuming there are no concrete balls in the way?