The most straightforward is to use the LEGO fence piece, first released in 1967. They can be laid in two rows, four studs apart, and they’ll serve as perfectly functional train track.

"This is our O scale, two-rail, Christmas train," said Brandon Jutz, Connor and Lillian's dad. " it was custom made ... adding a whole lot of Lego building. "I'm Lego first, then trains," said ...