Where is Hot Water when you need him?
The Illinois Central had steam locomotives for commuter service, but not 4-6-6T. I seem to recall an engine with a light mounted high on the tender so the commuter train could run in reverse, just like how Metra trains run now. Should be something at the Illinois Railway Museum too.
Didn't find that engine, but I did find this. Putting a link down in case of copyright issues.
https://www.railarchive.net/ra...eam/images/ic201.jpg
And what do you know, this engine is at the Illinois Railway Museum according to this page: