Blue Mountain Quarry is a quarry that made its first appearance in Blue Mountain Mystery. Merrick and Owen are based here. Skarloey, Rheneas, Falcon, Stuart, Rusty, Luke, Paxton (as well as Thomas, Henry, Toby, Percy and Spencer on some occasions), Dash Bash and Ferdinandand many other vehicles work here. Blondin Bridge is also located here. To access the quarry, engines have to switch at Abbey.
It has replaced the Skarloey Railway Slate Quarry.
Since the seventeenth season, the standard gauge track to the quarry has become dual gauge to accommodate the narrow gauge engines.
In Thomas the Slender Engine, a woman‘s vocals can be heard in the background at Night. This is Emily.
In Thomas the Slender Engine
At Day, it is inhabited by Molly.
At Night, it is inhabited by Emily.