I’m trying to figure exactly what this implies, I see no difference in site access.
MY assumption is it means you get access to those areas ordinarily restricted to subscribers only.
Well, I went to a “subscriber only” section and was greeted with a password prompt, so that seems not to be the case.
You can go to the pages for other magazines. For example, I just went to the Trains news page and read about the recent Oakland Amtrak collision.