gunrunnerjohn posted:No problem, you just need the power supply and motherboard. Lionel also used to have a powered motherboard, I see it still listed as available for $45. If you wait for the 1/2 price parts sale, usually with the warehouse sale, you could try to pick up a couple of these.
You can also simply pick up the generic power supply and a steam motherboard. For either of these options, you'll need to fabricate some connectors, they're JST-EH and JST-PH family connectors, available at Digikey.
So if I get one of these and a sound board it will work or the old power board, mother board, and sound board.