If you wanted to make the original track longer by adding a 9 inch straight track on each side of the original track, you would also have to add two single Lane 9 inch track on each side of the adventure track. Please see our items for sale for pieces designed to work with the adventure track such as 9 inch single lane straight tracks, bridges, switch tracks, road n rail tracks, single lane turnouts and a variety of curves just to name a few. Rails are plastic covered with aluminum.
Adventure track pieces you will receive. 3× 6 inch 90 curve track. 3× 9 inch straight track. 1x short straight track (goes to the left and connects to the curve that takes the vehicle back into the original Tyco track). Original Tyco track and vehicle are not included. Only in picture for reference and to show how it works. Pieces are not perfect but pretty awesome!