Other than Lionel that is.
I thought this would be easy but I have yet to find a source for Leoco 4 pin connectors as used on Lionel's motor driver boards. They appear to be part number 2420S, 2.5mm pitch or just under .100" . I tried the usual suspects including Digikey, Allied, Newark, Mouser. No Luck.
Does another company make an identical one? I prefer to roll my own.