Reply to "18" or 21" passenger cars"

This is a great Question, my thoughts are similar to others here, 18” being the right size for 072-096 circles. I have several sets of Lionel’s 18 inch aluminum cars, UP, Sante Fe, The Congressional, and have added LED lighting. Royz trains helped me out with the observation cars. I agree with others that the new 21 inch plastic cars, with those new-fangled couplers are not easy to back up, and they just look awkward with the hang over on the curves. I do have the Texas Special with 21 inch cars but run it on my upper level with 0120 curves and it looks ok. So, if one has 072 or smaller curves, I think the 18 inch cars look more realistic. I wish Lionel would return to making those 18 inch aluminum cars again. Happy Railroading Everyone.