Zn3?

David Smith, he of the world's smallest layout, has decided to plot a new course.

He's dabbling in the idea of narrow gauge, and has contemplated an EBT theme.

His narrow gauge world would be in Z scale. That would make a distance between the rails of 4.15mm.

I do believe that would be the smallest scale EBT themed layout in existence. I wish him the best of luck.

UPDATE: The subject of the only Z scale narrow gauge model (that I know of) will be the Pine Creek Railroad in New Jersey, not the EBT. Less ambitious, but more practical. Take a look!