The most promising leads would be the files of Greenfield Recorder, the Montague Public Library, and the B&MRRHS, both archive files and forum. The Athol Daily News currently does not cover Millers Falls, but it may have then, or it may have covered the particular story because of the transportation impact on the area. The issue of impact might also apply for the Worcester Telegram, Springfield Republican, and Daily Hampshire Gazette. Given the financial circumstances of most newspapers and libraries, I'm guessing that something that far back may not be available on line and may require a trip to view either hardcopy or microform records. There is a Montague Historical Society, but no contact information was given, so the Montague Public Library might be a source for that, as well.
"A gray crossover is definitely not company transportation."