Here's a side by side comparison of MT Heavyweights with Z scale 905 couplers and Micro-trains True Scale Couplers: Micro-trains Z scale 905: DSCN0806 by NorsemanJack posted Aug 18, 2018 at 5:18 PM Micro-trains True Scale Couplers: DSCN0805 by NorsemanJack posted Aug 18, 2018 at 5:19 PM To my eye, and also to my calipers, the improved coupling distance is the same in both cases. The True Scale's are a bit nicer in appearance (and also a bit cheaper), but they won't work well for anything but the widest radii (think 30" plus). They are noticeably restrictive around a 17.5" radius (i.e. the curve forces the couplers to rotate on their mounting pins in order to navigate the curve). Also, we've learned in another forum discussion that the MT heavyweight diner has different coupler mounting dimensions than the rest of the Heavyweights. I measured the mounting holes to be approximately .060" further from the car ends than they are on the other variations. This means that they aren't as "bad" as the other cars, but are still very wide in coupling distance. I won't have photos until I obtain some more 905's. Joe: do you know why the diner is different?