I cannot say yes or no to the railroad car body, but based on your description of a "Privet Drive" I typed "Privet drive maine" into Google Maps. It brought up a Privet Road in Dedham, which is southeast of Bangor. The satellite view shows a lot of trees, so many structures are hidden. Was it a dirt road they drove onto?
Alternatively it could be "private drive" in which case there's lots of those around.