But my best recent experience was on the Pike's Peak Cog Railway. This is a tourist operation only, because the only destination is the top of Pikes Peak. (In the summer they do have an intermediate stop to drop off hikers.) It runs from "when the snow allows in the spring" until "when the snow doesn't allow in the fall, or until January first, whichever comes first."

Last year there wasn't much snow, and I rode it on New Year's day. The rotary snowplow went first to skim off the two or three feet of drifted snow, which was pretty exciting, and then when we got to the top we only stayed for about 10 minutes because the wind was blowing so hard they were afraid the train would derail.

http://www.cograilway.com/default.asp