I originally had a 072 loop when I first built my layout then I decided I wanted standard gauge. After having standard gauge track for a while I wanted to run O gauge side by side again but I'm not willing to part with standard gauge. "Solution" install 5 rail track. This has been a week long project working a couple of hours a night at 1:00am after work. Gargraves does not make 5 rail curves so what do you have to do you may ask? "Bend them yourself" yup. Fun,fun,fun! All but 2 straights had to be bent,cut and soldered and secured to the table. All in all it worked out pretty good but a lot of work! Here is a Couple of pics O meets standard. I'll post a video later.