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Groundspeak Regular MemberMad Ned wrote comment for Boston and Maine Abandoned Tunnel - Clinton, MA
This tunnel was originally part of the Central Mass. RR, it was built as part of the track realignment when the Wachusett Reservoir was created. The original track went right thru the center of the reservoir, so it had to be relocated, but this required building the 1/4 mile tunnel, which exited straight onto a viaduct that was 1000 feet long and 130 feet high over the outflow of the Clinton Dam. If you go to the other side of the spillway, the track realignment continues thru a deep rock cut (50 ft or so) and eventually goes into Sterling. One expensive mile of track; it was also probably a pretty impressive ride in it's day.

Although B&M did run the line for freight until the 50's, the real death of the line came in '38 when dual hurricanes flooded several bridges on the line west of this.

Some interesting tidbits on the tunnel and viaduct construction can be found in the Metropolitan Sewer & Water board annual reports, particularly this 1903 edition during construction of the dam and tunnel. These are online as part of Google's book search:

(visit link)

(Check out the section preceding the picture, which details the construction of the tunnel and viaduct.)