So far my experience with this phenomenon is with the 90 ton coal hoppers but it probably is the same with all Atlas rolling stock.
I started doing a looooong overdue inventory of my engines and rolling stock. I made a excel spread sheet that list car type, road and road#. I then went to the Atlas website and looked up all their past releases. I then started filling in the spreadsheet. Once that was done I started to check off what I had in storage. I noticed quite a few road numbers that were not listed on the Atlas website. Question is; did Atlas release road numbers that were never listed? Or were they just not updated on the website? Anyone else notice this? Just curious is all.