One building that has received little attention in publications about the Monson RR is the so-called "long slate shed". This was a 500-foot-long bulding that was owned by the Monson Maine Slate Company and used primarily to store slate shingles prior to shipment. It was located a short distance across Chapin Avenue from the Monson yard on the branch to the Hebron (Pond) Quarry.
I have seen only one photo and two drawings of the long slate shed. The photo appears in both the 150th and 175th anniversary books of the Town of Monson. No spur to the shed appears in the photo, which shows the east side and north end of the building.
One drawing of the shed is part of the c. 1900 "bird's-eye view of Monson" poster. On that poster, the tangent track crossing Chapin Avenue extends to form a spur on the west side of the shed just beyond the point where the main track curves further to the west. Another view of the shed appears in an inset to the main poster.
The second drawing of the shed appears in the booklet advertising Monson as "the Switzerland of Maine". This drawing reflects some artistic license in that the building itself is depicted as paralleling the main track and Lake Hebron, which is not actually visible from the building site, is shown in the distance. This drawing also shows large identifying lettering painted on the end of the shed, which seems atypical of MMSC practice.
I have no information on how the long slate shed was utilized after the Hebron Quarry Branch was cut back to the east side of Chapin Avenue. However, the building existed at least until the August 1944 auction of the MMSC's assets, the flyer for which lists "SLATE SHED Just off Chapin Avenue, 500 ft. long, 40 ft. wide, with slate roof. This shed is sold to be removed hence no land is included".