SK interlocking begins just to the west Speonk station platform, and continues over North Philips Avenue. Speonk Yard is actually one of the few yards on the railroad that is remotely-controlled. Nonetheless, I personally think this is a nice little yard, and it contains a couple of tracks for storing diesel sets for The Montauk Branch.
For the most part, the yard is actually well-used and the yard tracks often will store trains overnight that will then represent the 5 peak runs out of Speonk in the morning. Longer sets such as the two DMs (the first one from Southampton deadheads out there early in the morning), can be parked on tracks 1 and 2.
In addition, Speonk is home to one of the very few wyes on the LIRR. The wye isn’t very long, so it’s not like they can turn a whole 4 car set (let alone a DM set), however, they could turn a MP15 or DE/DM if need be. The center of the wye/yard also houses a collection of trailers and crew parking spots therefore many crews report here.
As of May 6, 2006, new signals went into service and therefore splitting SK interlocking into 2 interlockings SK 1 and SK 2. SK 1 is the part leading to the yard and switches, while SK 2 is south of the tracks/ E. of station. By the way, the Speonk Freight Track, which runs south of The Montauk Branch, is not considered part of the yard.
Neighbors:
SK is quite a lone interlocking, with HB bordering it to the east and JJD interlocking bordering it to the west in Mastic-Shirley.
Also, since it's Flashback Thursday, here's a excellent photo I found of Speonk Yard:
Anyways, that’s about it for SK interlocking. While there’s not too much to say about this interlocking, it’s quite an important one!