If you put on extra track then what is pictured this train will not run! Extra track would be good as a back up or for another train set!
So 12 tracks would be the maximum with 8 curved tracks and 4 straight tracks. It is probably possible to make it work with more tracks or a different set up of the tracks but im unsure!
12 curved tracks and 10 straight tracks included. An extra lionel ctc lockon so two of them.