The Old Quarry is an abandoned quarry located somewhere on Sodor.
When Percy was sent to pick up the Mayor of Sodor, Diesel tricked him into going to the quarry, telling him that the Mayor would be waiting there. Percy set off to the quarry, but became stranded when he ran through a section of flooded track which doused his fire. Diesel returned here to rescue him, but his generator went out when he went into the water. The Search and Rescue Team managed to find and rescue them.
- The quarry's set is the Sodor China Clay Company set, redressed to look like an abandoned quarry.