RSJB18 posted:Dan- I have a couple older PS/ PS-1 locos that run great under conventional operation. The speed control is nice and the sound package is OK. Just watch for units with 5V boards which are prone to failure. Depending on the model, a new battery or BRC module would be about the only upgrades required.
I think you're mixing metaphors here. PS/1 has no speed control, and the 5V boards to watch for are the early PS/2 that use the 9V battery.