Lionel already has the steam blowdown effect in the legacy remote. If you cycle it correctly but push/release as a steamer starts out out from a stop you can almost simulate leaving from a station (i.e. Cylinder steam exhaust). Any reason this has never been incorporated into a keypad option?
I'm still green about stuff this technical so dead sure Gunrunnerjohn has an explanation.
Celebrating New Years a day late tonight and my brain pondered upon this while running my new steamer