The first train station I ever photographed was Shellmouth Manitoba. It is long gone, but the pictures was published front cover world wide in a magazine called "The Grapevine" if I remember correctly. That was almost 40 years ago.
I began photographing rr depots around 1980. Since then I have shot nearly 5,000 of which at least 200 are now gone. Most of my photography is in the northeast US where I live, but the Great Plains and the Rockies are favorites of mine as well.
I have not made railroads stations any kind of specialty, I have perhaps taken pictured of 10 and that is all. Unfortunately, so many of them that were built in Canada have been gone for a long time that I think a photographic expose here, would be quite difficult. So I applaud your efforts. Is there any possibility that you will put them together into a show to tour?
I don't know, I have always pursued this as a hobby rather than as possible show or publication. My railroad depot photos are randomly scattered over at least a different rolls of film. But, who knows?