The whole series "Train" from Duplo is recommended warmly. We offered the first elements to my son for his third birthday. In just over a year, we continued to expand the number of items and continues to play regularly. With a little imagination, it is possible to build an infinite number of different circuits. Unlike other reviews, I did not notice any power problem on the locomotive. After a year of use, all the elements are still in perfect condition. Only regret: that there is no more different elements, particularly with regard to locomotives and wagons. Other than that, no problem, it's a great product ...