TAZARA train 15

 The back of the train was simply left open. It would have been more dangerous, were it not for a large sign with a skull.

A sign warning of the danger of stepping off the back of the train. 

You could just walk right off the back of the train if you weren't paying attention — which was probably why the sign was there. A popular spot for people to go to smoke, it's also where a priest hung out with his pet goat during the journey.