Adriatic posted:?? Why not?? Lighted cars need a pickup added for the center. Non powered cars shouldn't pose an issue. (correct me if I'm wrong but G is 2r, St is 3r, both are the same gauge... or is it 1gauge or wide gauge?)
G scale (wrong name anyway) uses a gauge of 45 mm and Standard Gauge uses a gauge of 54 mm. So the gauges do not match, so trucks need to be exchanged.
For those who want to know about Gauge and Scale; I wrote a (free to download) e-book about it: http://sncf231e.nl/gauge-and-scale/
Regards
Fred