The Springfield, Athol & Northeastern Railroad was finished in 1873 and connected Athol with Springfield, Massachusetts. This branch of the Boston & Albany was abandoned in 1935 when its route through the Swift River Valley was submerged by the Quabbin Reservoir.
http://en.wikipedia.org/wiki/Athol_Junction
http://en.wikipedia.org/wiki/Quabbin_Reservoir
http://www.mass.gov/dcr/parks/central/quabbin.htm