"FRA Inspection Train at Great Neck"
One of the Federal Railroad Administration's several inspection railcars pays a visit to Long Island Rail Road in the form of DOTX #216. This car made trips on all of LIRR's lines, testing all main tracks. This day (10/8/19) they covered LIRR's Port Washington Line. Here we see the train passing by Great Neck Station while heading east towards Port Washington.
Below is a more detailed description of the car provided by the FRA: "The DOTX216 is a converted Amtrak Metroliner coach equipped with a track geometry measurement system, a rail profile measuring system, a multi-car ride quality measuring system, and other state-of-the-art instrumentation for conducting railway research. DOTX216 is capable of making track measurements at speeds up to 165mph and serves as a high-speed track research instrumentation platform for a variety of tests and research projects in the Office of Research and Development. DOTX216 is also used to support efforts undertaken by the FRA's Office of Safety."