If you're looking for info on the history of the StL&C/Lamoille Valley, or the last days of the Lamoille Valley and the lines around Littleton, Whitefield, and out to Berlin/Groveton, Jim Jones has a couple great DVDs. They include anecdotes from former employees, local townspeople, railroad historians, etc, still images and videos, right up to the final days.
StJ&LC: Vermont's Lamoille Valley Railroad dives into the history of the St J to Swanton line.
B&M at Twilight: Background, along with the final years of not just the LVRC but the NH&VT when it ran down to White River and up to Whitefield/Groveton/Berlin, and also the Montpelier & Barre/Washington County Railroad.
https://vermontmadevideos.weebly.com/