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It's a remote control train, right, with all-plastic tracks (i.e. they do not have metal rims)? Then just hop on down to your local Lego shop and buy more of the same! They'll have two types, no doubt, boxes with 8-each straight and curves (you need two boxes to make a full circle); and similar boxes with flexi curve tracks.
BUT! if you ever want to expand into electric trains, they won't run on these tracks.
You can also buy other, discontinued compatible RC tracks on Bricklink, or single pieces of straight, curved, etc, instead of in the multi-type packs LEGO sells:
Most people I know pretty much hate the flexi-track, though it has some specialty uses from what I understand.
All the other track - 9v, 12v, 4.5v, etc are all older systems that LEGO stopped making years ago. Many LEGO train enthusiasts still prefer these older systems, but if you are just starting out, you are likely going to be much better off sticking to the current LEGO Power Functions RC system.
Of course, 7938: Passenger Train includes a complete circle of track and a train too!
7937: Train Station includes four sections of straight track and is retiring soon.
Cheers from Claremore, OK!