If you goto Freeware Announcements and in that thread look for "Steam locos from 1856 till 1915" (still on 1st page), you will
find all steam locos may be set to static => no sound, no smoke, no driver and towable.
This is done via a script, that is "rather general", so the script may be moved to other steam or diesel engines.
You will be toggling between running and static mode via a keyboard cmd or window handling in Surveyor or Driver mode.