With today's announcement by Amtrak that they are ending excursions and significantly cutting the movement of private cars, this is something you might never see again. Amtrak's Lakeshore Limited is hauling an additional 11 private cars on the end of the train that are en route to the AAPRCO 2017 Convention in September of 2017.
The Green Mountain Flyer was a special train of privately owned railroad cars that are part of the American Association of Private Railroad Car Owners (AAPRCO). The train was in conjunction with the annual convention in 2017.