It's not, HO = 1/87, is slightly different. You can't just buy pieces of already made track, but you can buy HO rails and rail connectors then pu some basswood that is already to size and cut the ties to the right width. It's all quite cheap. If you want I can show photos of what you'll need and maybe Wayne can direct you to his local HS that deals in RR stuff. Once you get these parts, you'd have to put it on a piece of board. I would also pu a piece of RR cork that they use for under the track to push the tiny pins into to hold the cleats. It also raises it off the board and allows you to put some ballast in.
MC just check some sites on Ebay and you'll see whats out there, thats where I picked mine up at and each of these items are relatively cheap. I have the dimension you'll need for the basswood ties if you want them.
Terry