Internal Resources:

Scales and Rails essay (*.pdf)
List of all the downloadable Books sprinkled throughout this website
List of all the downloadable Published Track Plans sprinkled throughout this website
The Model Engineer and Amateur Electrician: historic magazine archive - (just to show how your ancestors played)

External Resources:

History, Concepts, and Operation of Small Layouts
Micro Passenger Layouts - (be sure to examine the other parts of this website for additional micro layout ideas)
Lionel Trains Identification Guide

The Diesel Shop - (Diesel Locomotive specifications to assist your hostler in selecting suitable power for a train)
Historical Railroad Maps and Timetables
East Penn Traction Club - (Trolley and Light Rail Vehicle modeling articles)
Central Electric Railfans' Association: bulletin archive

The O-Scale Resource: magazine archive
Model Railroad Hobbyist: magazine archive