I recently discovered that Google is making books that are in the public domain available online. This may not be "new" but its new to me. I recently got hits on two when I was searching for info on prototype bridge tie size and spacing:

Notes On Track

I am currently in the process of building a 3x5 test layout. The givens reflect things that I wanted to cover to prepare myself for the next layout. In some cases, I did things in a way less suitable for a small layout in order to prepare myself for the next layout.

Givens: