My kids love anything with wheels. It doesn't matter what as long as it's rolling' and moving fast. This is a DT layout I did for My Punch, showing photos of my kids riding a train at the fair. They really enjoyed it even though it was moving slow in a circle and didn't go anywhere.
I added a few handmade embellishments to the layout: a rainbow I cut from a scalloped paper, sewed clouds and two wheels with sewed accents as journaling blocks.