Friday, June 20, 2025

Interlocking Walkthrough: JJD

Today we'll be checking out the interlocking in Mastic-Shirley. This interlocking is known as JJD, and is a relatively simple interlocking consisting of a pair of switches forming a passing siding, similar to many of the others out here on the Montauk Branch. While it's pretty simple, that doesn't mean it doesn't get a good bit of use and this is one of the more well-used interlockings on the Montauk Branch with a parade of scheduled meets.

Train waiting on passing siding. (Photo: MrMaster767)

Seen here is a train waiting on the passing siding. This meet was the common feet between trains 2706 and 2707, which now continue to meet here around 1pm as 8 and 13. This siding gets a decent amount of use as trains 47 and 46 and 26 and 49 also meet here in addition to trains 2 and 3. 

On weekends, trains 6006 and 6001 meet here around 8:30am, followed by #6054 and #6037 around 12:19pm, #6038 and in the summer time, #6009 around 4:00pm, #6040 and #6019 around 9:25pm, and finished by #6014 and #6049 around 11:40pm at night.

As you may be able to tell in the photo below, the siding is 12-cars long, and the reason why they did this was because it needs to be able to accommodate the long Summer Hamptons trains as well.


It's controlled by BABYLON tower which has controlled it ever since PD tower closed in 1980.

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