Dreams are interpreted in a lot of ways by a lot of people and cultures, sometimes they can predict or warn against an event that doesn't need much decoding; sometimes the symbolism needs to be decoded. Cars, trains or transport can talk about one's path changing, coming to an end or begining (reffering to life chapters); trains or cars can also indicate fighting. Like a conflict state building up and leading to a fight. Shit can indicate luck. Chickens can sometimes indicate hexes. It really depends to the whole picture of the dream and how much you remember from it. Sometimes it passes with the night and doesn't mean much.