Two cars can run simultaneously. This is a basic set of straight and curved rails, so it's easy to reconfigure and perfect for expansion rails! This is a set of 24 rails + 3 bonus rails in total. [Set Contents] ・Curved rails x 16 ・Straight rails x 4 ・1/2 straight rails x 4 [Bonus] 1/4 straight rails, 3 types x 1 each This item has been stored at home and has minor scratches overall. Please understand that this is a used item before purchasing.