I had posted a few weeks ago looking for 6414 runners without autos. I found 1 on the bay and one at my LHS.
My purpose was to use the MTH/Ertl 50's Autos on the 6414's because the loaded MTH cars don't fit under the 213 or 313 bridges. I was willing to cut the 213s but not the 313. So last week I searched the Bay again and came up with a reproduction upper part of the 6414. I never new that they existed. I grabbed two of them and promptly searched my stash for flat cars. I forget the exact number but many cars use the same flatcar body no matter what their number or load I think it's xx11 - x. For runners I think that they are excellent. A bonus is that the '52 Caddys don't fit on the original 6414 because the frame is rolled at the top. The plastic reproduction doesn't have that extra thickness. So now I have my 5 auto loaders with 50's autos.