Buster Keaton at Knott's Berry Farm, 1956.
Keaton was no stranger to trains. Steam engines figured more often than not in his silent era comedy shorts and was the subject of his feature length film The General (which also has one of the most expensive one-shot stunts ever pulled in Hollywood). His cameo in Michael Todd's 1956 version of Around the World in 80 Days was a train conductor. Therefore Keaton jumped at the opportunity when he was contacted by National Film Board of Canada animator Gerald Potterton to star in a 25-minute short traversing Canada by rail. Though directed by Potterton, the film is Keaton's through and through. Not being hampered at all by his age (he turned 69 during filming), Keaton devised and executed most of the gags and stunts himself.
A documentary on Keaton was made concurrently, entitled Buster Keaton Rides Again, showing his creative process. It also shows Keaton enjoying the resurgence in appreciation for his work in the Golden Age of Television. After decades of obscurity in post-sound Hollywood, he was making a comeback (including a very memorable episode The Twilight Zone). Unfortunately it came to an end when he passed away in 1966 at the age of 70.