Yellowstone area!

Are there any Scenic/Excursion lines that should not be missed while vacationing there?

Thank You

Check out the Alder Gulch RR operating between Virginia City and Nevada City. A very authentic Montana ghost town.
tom
http://aldergulch.com/

West of Rapid City S.D. is Hill City,which has the Black Hills Central tourist railroad.Narrow gauge,steam locomotive.