[2] The Engineering Work Section, Highways Division of the Isle of Man Department of Infrastructure has its northern depot at Glen Duff Quarry, including a domed storage barn built in 2003 known as the 'Igloo', for storage of road salt treatments during the winter.

Within the 2.57 hectares (6.4 acres) site, the Trust observed hazel (Corylus avellana), oak (Quercus × rosacea) and silver birch (Betula pendula) trees along with wild strawberry (Fragaria vesca) within the depot and old quarry.

[7] Glen Duff was part of the 37.50 Mile Four Inch Course for the RAC Tourist Trophy automobile races held in the Isle of Man between 1908 and 1922.

[8] In 1911, the Four Inch Course for automobiles was first used by the Auto-Cycling Union for the Isle of Man TT motorcycle races.

[9] This included Glen Duff[10] and Glentramman section and the course later became known as the 37.73 mile Isle of Man TT Mountain Course which has been used since 1911 for the Isle of Man TT Races and from 1923 for the Manx Grand Prix races.