This cargo trailer is both a railcar and a trailer for a truck. The rail wheelsets are removable, and the road wheels are then available to be towed down the road. I built this many years ago and it's been on numerous BayLTC train layouts, but I never put pictures online until now.RoadRailers on the BayLTC train layout in Pleasanton, November 2008.

Read more about it in the RoadRailer Trailer entry on Brickpile.