I guess one thing I should add, is that there apparently were several different suppliers of tunnels to American Flyer over the years. I think this is mentioned in either the Greenberg's guide, or more likely in the American Flyer Collector Club's magazine "The Collector". I suspect the different suppliers account for the different look of the tunnels over the years. I know that the 81, 82, 83, and 84 tunnels feature a relatively distinctive look and are somewhat lighter in construction as compared to the later tunnels, which will be featured in the upcoming posts.
NWL
