I only saw the ending of this movie but it stood out. I’m sure its from the 70’s, Its some sort of chase movie, a group of young people are evading the local cops for some reason. They are driving around in the country trying to reach an area that has a bunch of highways and byways that the cops won’t be able to catch or trap them so that they can get away. They manage to get to that area and they start celebrating that the cops won’t be able to get them now. While they are celebrating they die in a train crash then the movie ends.