p.s. I did try to "add engine" via the DCS controller, just in case the magic marker notes were wrong, no engine found.
Did you use a programming track or equivalent? It's been my experience over the years that if the engine being added has the same ID as another engine on the layout it's not going to add unless using a programming track... The engine should add anyway but....
Does it have a front coil type coupler?? I believe the original ps-1 had thumb tack couplers.