Well, you could build yourself some 5 rail track using tubular rail. I had some that I gave a friend who is in the process of building his new layout to run a loop of standard gauge and o- gauge. There are no switches or cross overs however, I think a crossover could be engineered with a little effort. Check with USA track. They may be able to sell you everything you need to build your own 5 rail. It may be a little more pricey than other brands however, the quality of the rail product is far better. I used some, not all, USA track on my modular standard gauge layout and have had some problems with the other vendors track especially when I am set up outside in the sun for a couple of hours.