By searching OGR forum for Evans Auto-Loaders I found this old post. I have two Lionel 6 car Evans Auto-Loaders, they are Lionel 9125, N & W Trailer and Train Auto-Loaders, saying Built 1-73.
They will hold 6 cars but the bottom deck is 1 1/2 inches wide, 1 3/8 inches high and the car body is 12 7/8 inches long. The bottom will only hold smaller cars.
The older Lionel 6414 Evans Auto-loader will hold 4 cars and the bottom deck is 2 1/4 inches wide, 1 1/2 inches high and the car body is 10 inches long. So the K-line 6 car Auto-Loader now has company. It appears the K-line and Lionel 6 car bodies are different.
The Lionel 9125 is almost 3 inches longer that the Lionel 6414 and looks that much longer on my O27 curves !
Charlie