Help with track equipment

O Gauge track Information

I would like to set up a layout that will accommodate a train that requires a 72 Inch radius.

I want to set up a siding along the straight side of an oval.

What type of switch and track will I need. My intention is to try to keep the siding as close to the mainline as possible

Best to repost this on the Classic Toy Trains forum, on this same Trains.com site. That’s where the O scale tinplate modelers hang out.