AtoZ,
Nope, he's talking about a 2-rail, O scale switching layout. That 0-8-0 AHM engine he is talking about is the O scale IHB engine Kit along with the motor kit to run it.
Artful Dodger,
It would help in track plan design if we knew the radius of your "tight" curves. Also, do you intend to use the old, complementary "tight" radius switches, and, if so, how many of each (right or left hand) do you have? If planning to use different switches, what do you have in mind?
Chuck