I found these great videos of some small HO train layouts.

I have more general guidelines for HO train layouts here, and another article with specifics of laying HO track here.

Small HO Train Layouts

Here’s a video with an excellent and detailed discussion of the thought process behind a 5′ x 18″ switch yard.

This video is of the 5′ x 18″ switch yard in action.

Here are some good tips of a work in progress. It’s a 4×8 layout, I put it here for the tips.

If you have some other suggestions for videos to add to this page about small HO train layouts, leave them in the comments.