Those sprung trucks look great - Flyer's diecast passenger trucks don't look as accurate to me as the trucks under those Sylvania passenger cars. The observation's "boat tail" looks kinda long, but overall they look sharp. They look like they may be longer than Flyer's cars - are they different lengths?
An O gauge parallel would be AMT's O gauge extruded aluminum passenger cars being on the market for several years before Lionel woke up and made their corrugated cars available, albeit with with just a coach, vista dome, observation and baggage car compared to AMT's full compliment of cars including baggage, combine, RPO, coach, diner, roomette (with several differently named cars), vista dome and observation cars. Once the titan of 3 rail trains entered the market AMT/Auburn saw the writing on the wall and fortunately found a winning buyer for their line by Kusan/KMT in Franklin, Tennessee. The passenger cars continued for a few more years before the Kusan folks stopped production of their O gauge trains.
