Everything about new bright is smaller than G scale. They run on G scale track, but they otherwise seem like a smaller scale to me. Their wheels are smaller. If they had people they would be much smaller. Some of them have nice bells and whistles, but they are a cheap chinese toy grade in my opinion. A lot of the cheap chinese toy trains use their own style of couplers incompatible with the more serious brands. Scientific trains are probably just as cheap as new bright but are closer in size to better brands. New bright may be the smallest of the supposedly G scale trains. Eztec and Echo trains are much larger than newbright but also smaller than scientific. And scientific is a bit smaller than playmobil, LGB, Bachmann, etc. I have a bunch of new bright stuff I want to get rid of. Don't even think about running newbright together with LGB; if you do you might as well get N scale to work on HO track and run N scale with HO.