I must admit I had to look up "The Switzerland Trail of America" as I had never heard of it before. Apparently, in its heydey it accommodated much rail traffic. Today, it appears to be little more than a hiking trail:
http://en.wikipedia.org/wiki/Switzerland_TrailGiven the date of the postcard shown (based on the stamp) I suspect it was postmarked sometime in the 1910s, which makes perfect sense based upon this period newspaper article about the demise of the railroads that were once ever present in the region:

Kind of sad, really, but certainly a nice collectible from a by-gone era.