Lights in new Pine-Aire Yard

While stuck in traffic on the N/B Sagtikos Pkwy. last night and crawling over the Main Line overpass, a glance at the new yard showed small yellow lights at different intervals along the yard tracks. The yard was empty, so this was easy to see in the darkness down there. Anybody know what these are? Thanks.

Foul markers for the new yard.

Is that a new thing from the FRA for yards, or just a nifty option the NYA went for with this project?

Anyone have any close-up photos of these marker lights? I've never seen them before. Thanks.

The costumer on the north end of the backtack(Pineaire) will start to receive or has begun to at the former site of Emjay Environmental. I guess you can add another fleet of C&D gons to NYAR's repertoire. For awhile Emjay went out of business and AJM paper just north of him stopped taking delivery of carloads. ELM was the only costumer left on the backtrack.