Last Saturday (Sept. 13), TCM showed "Strangers on a Train," one of my favorite Hitchcock thrillers. It was, of course, terrific, and the print was good. But the last part of the movie seemed to have been lopped off. To explain (without giving away plot points): The TCM version ended with a phone call, but a version I saw several years ago featured a coda on a train, with two characters reacting skittishly to a fellow passenger's request. What happened to this footage?