The last time American audiences saw Jackie Chan, he was sharing the screen with Johnny Knoxville in *Skiptrace*, a film that many found forgettable. Now, the martial arts icon, who is now in his sixties, returns in **Railroad Tigers**, a movie where he both stars and co-produces alongside his son, Jaycee Chan. This project feels like a vanity endeavor, bringing together Chan and his son while also assembling a group…