train travel-rail journey in bd/uk/urope

Train journey, on the roof is very dangerous and adventure also, Train journey on the top of train very risky however it is very interesting also, but if the train goes with very speedy like more than 120 kilometer per hour it is very dangerous for anybody to be on the train. If it is around 100 kilometer per hour. however its not safe, because maximum time rail line is to the remote area and remote area are not under cover of safety group, so it is highly prohibited to journey at the roof of train. one day