Not that I would ever switch over ... but I've noticed recently that the "inside height" of the Micro-Trains Z scale PS-1 boxcars and 50' ACF boxcars appear to be closer to the prototype than their N scale counterparts, or am I not seeing it clearly due to the smaller size?
Don't worry, the PS-1 has a molded on roof walk.
I'm still interested in 2007-2008 BNSF in Z scale, but it's been amazing the only useful products to come out in the last 2 years for that plan are Showcase 53' container frames and a re-run of AZL SD70s. Modern releases from MTL have died off, AZL has just done oddball freight car prototypes instead of fleet cars, and Intermountain has yet to release their modern reefer. I'm saving money, but it just seems odd.