Hi BC,
You could add four remote switches, 2 lefts and 2 rights connected curve to curve to join the two loops and operate one train with a small consist. This wold present the challenge of learning to manage the switches and create some fun for successfully doing so. That would build a foundation for future expansion. Add an operating track on the inner loop to dump logs. (easy to pick up and do again).The horse and milk box car with platform are cool too (a little tougher to load).
Just some thoughts from a guy with an 18 month old grandson. Built him a 4 x 8 loop with a Polar Express this past Christmas. Hit the whistle highballin' & smokin' and saw the look. I think we are both hooked.
