While looking through my New England photos for other surviving examples of the Rutland 2700-series flat cars, I chanced upon another 11-pocket flat car. This one is in company service on the Conway Scenic Railway, and is lettered GT 54559.
A photo of the car is attached, along with Steamtown's Rutland 2777 for comparison. The GT car has a channel end sill, while the Rutland car has a flat plate. Otherwise they are similar. Some styrene strip and a new deck could make the Athearn car a close match.
I'm not sure whether the GT lettering on this car is correct. In my 1958 ORER, there is no longer a separate GT reporting mark, only CN, and no number like this exists. Maybe it is older, or maybe it is fake lettering on somebody else's car. Any ideas?