The annoying thing about MTH cars (and locos) for me as a Brit is knowing how accurate they are just from pics. I got an early MTH version Airslide second-hand and the are very good, probably why Atlas chose(?) the newer improved version (more metal bits). Maybe if we get enough feedback to Atlas, they will do something about 2-railing Premier models. Anyway, buy one, check out NWSL.com for wheelsets or look at current MTH/Atlas 2-rail trucks availability.
Jason