The biggest steam locomotive is whistle-stopping across the U.S. (npr.org)

Not quite the biggest steam locomotive, the DM&IR Yellowstone class outranked them in many measures.

https://www.steamlocomotive.com/locobase.php?country=USA&whe...

Schedule of stops is here: https://www.up.com/about-us/history/steam/schedule

I took a steam train yesterday. They should be called coal train, because it was beyond disgusting. If you like fresh air - highly recommend to avoid such experience.