Dream of screaming

Hi, have dream about the train it was blue and yellow colour, it was about to start to move but there was people putting inside the train some canisters with the some staff like water sky-blue colour, and I have feel I have to remove them and stop those people ,and I try to get in and I couldn’t because it(train) start to move ,then I have jump out, after I had float somehow far from it and I saw how it blow up and people was screaming and crying and calling for help but I was not able to do that. it was some big city with the allot of bridges and train rode was under them, around was very hi buildings I think it was near water or river or see this I didn’t gated. What das it mean?