The southern border of Glacier NP is the railroad.
https://www.nps.gov/glac/learn/education/railway.htm
So, in 1891, the continental divide finally was crossed and the rail barrons were trying to get people to use the railroad. They saw people taking steamships out from NYC to Europe to go see the Alps, and, well, they knew a thing or two about mountains, now too.
So the Great Northern Railroad petitioned Congress to make a park in the area that the trains would service.
In addition to the park proper, a number Swiss style chalets were built through the park that were approximately 1 day horse ride apart from each other. With this setup, you could take the train to East Glacier or West Glacier, go hose back riding through the mountains, and then get back on the train on the other side and go home.
While many of these chalets have been lost to time, some still exist and are maintained - https://www.nplas.org/sperry.html https://www.mtpr.org/montana-news/2018-06-06/funding-secured...