I came across this a few days ago on another railway modelling website. It's an amusing short film, starring Buster Keaton.
While you're on the NFB's website you should browse around a bit- a lot of interesting films you can watch for free, including one called "Train Busters" about RCAF fighters strafing and destroying a Nazi munitions train.
"It is one of the happiest characteristics
of this glorious country that official utterances are invariably
regarded as unanswerable."
-Sir Joseph Porter, First Lord of the Admiralty (HMS Pinafore)