These videos were taken at Babylon station on the Montauk Branch. The first video is of a eastbound C3 train with DE30 408 departing the station. The second video is of an M3 train arriving at Babylon. Both videos were taken in September 2015.
Speaking of M3s, I got my first ride in months on one and also got some time at the RFW, though I didn't take any videos.