Entering the trainyard, you saw a cluster of zombies near one of the cars. After killing them, you opened the train carriage and saw Rahim lying in it, and next to him - explosives.

I didn't think I'd make it, so I armed the bombs. They'll blow in less than five minutes!

He noticed that you saw a bloody wound on his left leg. Not wanting to tell you the truth about being bitten by a zombie, he just nervously waved it off.

Huh? Oh - I cut myself. It's nothing, damnit, just plant the bombs!