I ran across a tremendous resource at the University of Vermont web site. A collection of historic photo graphs of Vermont, many of which show scenes familiar to railroad modelers of the state. I found two of them of particular interest:
The first was this view of Essex Junction that shows the industries located in the around the wye - this shot dates from 1930 (the dates on some of the captions have been questioned, but the presence of the Burlington & Lamoille RR trackage in the middle of the wye makes me believe the 1939 date.
Another neat find was this photo showing a close up of the Demeritt Company in Waterbury.