I go to the Post Hotel once a year, and love the staff, service and this hotel.
Sure the train is loud but you are in the Rockies and the railway system is part of the history.
We have a Condo in Canmore and guess what- the trains are loud there as well.
The railway station (now a restaurant) is within walking distance and the drive to Moraine lake is awesome.

We had been RV camping and decide on the Post for a nice meal out. We were not in our Sunday go to meeting clothes but we were in no worse turn out than any of the other diners. The Maitre d' was stuffy, pretentious and unwelcoming. The waitress was stiff but attentive if not well informed about the food she was serving. The menu is extensive and although not imaginative presented itself as first class. The food was disappointingly ordinary. Seasonal vegetables were a mound of over cooked yellow beans with bacon. The roasted potatoes were dry and appeared to have been kept in a warming pan too long. My husbands buffalo was fine but my fillet did not have the reduction the menu said it came with. The wine list is excellent. My coffe was luke warm but the waitress kindly made me a fresh pot. At $250.00 the bill was ridiculous. At that price I don't want to afford a second chance.

We were staying at the Chateau and the concierge recommended dinner at The Post. I was so pleased, I couldn't have had another meal in the Saloon Bar. Dining options at the Chateau at this time of year seem to be limited.
Dinner at The Post is at the other end of the spectrum....it was magnificent. My son had a bison steak, my husband had caribou and I had salmon. All beautifully prepared and cooked. Lovely atmosphere, open fire, great staff. Our waiter Stefan was knowledgable about the wines (the cellar is incredible...25,000 bottles) and the menu. The dinner was a highlight of our trip, we loved it.

This is a very expensive hotel. I paid over $300.00 for a very average room. I was looking forward to a Jacuzzi bath in the morning but it was not working. The beds are hard, the trains are loud and I should have spent a few dollars more to stay elsewhere. I won't be staying again, nor will I be recommending this overpriced very average hotel.