So you get one person being overly loud and dramatic, and the other one not. Anyway, one guy runs out of dialogue, so he decides to go on the train and defuse the nuclear bomb. They lower him into the car with the bomb and let him go to it. Just like everything else on the car. While the guy is in the train, some of the other crates break, and some green goop starts leaking out.
Toxic chemicals are always green and goopy.
After getting stuck under a box, the guy gets lifted back out of the train. Then we find out the most amazing part of the movie. The answer is simple. The flammable chemicals become even MORE flammable when doused with water. So a bunch of helicopters are used to put out this pink powder on the train.