The Den is the staff mess room and amenities block at Boston Lodge, ref. 101 on the plan. A single-storey building in the style of the time, it came into use in 1977 adjacent to the former brass shop ref. 98. It replaced a facility in the building now used as the Electrical Workshop (104). It occupies part of the site of the old Sawmill.
Current plans are to replace this building with a new larger two-storey amenities building which will look more like the old sawmill.
- "Boston Lodge", Ffestiniog Railway Magazine, Issue 76, page(s): 4