I just finished lowering my Lionel B-unit (super easy by the way, just four lock washers 0.045" thick) to match my Atlas A, and realized that I like the steps on the Atlas F2. A good man named John Sethian has mentioned that he uses the P&D Hobby PDP5050; but looking on the website, I see part numbers PDP5050, 5051 and 5052. I think 5052 are the same parts as the 5050, but 8 per package instead of 4...
Anyone really know the difference in the P&D part numbers? You can easily see the difference between the Lionel & Atlas ones, even though they are both metal.
Thanks,
-Mario