In the evening, I dreamed of meeting my ex (a stranger) at the train station (the train station in my hometown). She is leaving by train, and I want to hold her hand.

Let me understand. First of all, you dreamed that you met your ex at the railway station, which means that you will meet her again in the future. He doesn't want to leave, which means she will express that he wants to get back together with you and go to the factory to see the body. He won't let you call the police, which means she broke up with you before, and there should be something behind you. The truth is that you're back together.