I’ve seen it mentioned several times that “locos with PS1 are cheap on eBay because they have problems with modern control systems, but are a great buy if you use conventional transformer control”.
Reading a bit about this topic, what I actually find is a lot of detail, some of it inconsistent or contradictory.
What actually happens, if you try to run a PS1 equipped loco from the transformer, with no TMCC or similar control system present? What does it actually do?