Is there a model train layout in the museum? If so what scale is it? And where do the excursions run?

There is a nice HO layout at the museum. The excursions run between the platform at the museum to Monterey up on the Cumberland plateau for the furthest trip. The most common excursion is a shorter ride to Watertown and back. The layover in Watertown is wonderful, the town participates and there are nice restaurants and shops that look forward to the scheduled excursions.

One runs up to delmonaco winery in cookeville... others run to Lebanon and Watertown

Huge model train layouts

It's truly an amazing experience..