The Narrow Cavern is an Ore Mine located near the Skarloey Railway and the Center Island Quarry.
Not much is known about the history of the Narrow Cavern, but it is a site that is frequently visited by the Narrow Gauge engines to mine for ore. Paxton and Norman passed through here on their way to their new jobs when they had just arrived on Sodor.
The Narrow Cavern is very similar in appearance to The Blasting Site. Its features include:
- A large bridge with narrow gauge tracks running on it
- Two standard gauge tracks running parallel under the bridge
- A small tunnel that the bridge leads into
- Several warehouses
- Several workman's residences