For me it's my latest acquisition: these Lionel Heavyweight 18 inch passenger cars (in the video below) that glide through my 031 curves after unscrewing the steps at the ends of each car:
These passenger cars are the correct color and style to be good models, IMO, of the passenger cars that ran on the Put, which is the theme of my layout. They also work for other NY Central divisions and the Boston & Albany, which is another favorite railroad of mine.
I am so pleased that Lionel made these cars so that the steps can be unscrewed; otherwise, I would need 054 curves or wider to run them. Arnold
