This is one I don't understand, even after spending two days working on it. Once again, it's the Lionel 6-82026 #497 Coaling Station recently released. On the up stroke, it would jam so tightly that to lower it required two hands and a lot of wiggling. Keep in mind that it has a limit switch that shuts it off at the right time.
After taking it back off of the table to my workbench, the only thing I could see at first was that in full up position, it looked like the rollers for the pulleys were tight to the roof. I ground some plastic off so the pulleys turned freely. Put the roof back on - same problem.
After more monkeying around (after all, I didn't want to ship it back to Lionel), I discovered that with the roof off, it worked perfectly. It appears that to snap the roof back on by the end tabs that hold it on, it puts enough pressure on the Station ends to upset the geometry of the unit. Solution - grind off the tabs and let the roof rest on top of the structure with no end - to - end pressure. The roof isn't going anywhere unless you have a hurricane on your layout. Bottom line - it works smooth as silk now.