Lego - 7938 - Construction toys - lego city

This is really good lego set, new parts are provided and the engine seems more powerful than the old lego engines.
For beginners, I recommend taking the additional lots for rails avoided having a circle beast.
This set requires AAA batteries 9 (6 in the battery pack of the train and 3 in the remote), the train has 7 speed front / rear.
There is no electricity in the rails because the batteries are in a closed block and the first locomotive.