I think quality is not very good, the locomotive was working for a little time, then started to get jammed. Now not moving at all, anymore. Opened it and the gear next to the motor is quite soft plastic. The motor is slipping on the gear. We didn't use it in an abnormal or ruff way.
Train set is a total crap: train goes of the track almost every time on the junction, buildings are made of paper, and it's not mentioned anywhere in description. Overall product quality is really very low. Do not fall for the pictures and video, it's a total scam. I could have bought a proper product in my own country for this kind of money. And, yeah, waited for 2 months for the train to arrive, because of the seller's mistake. Total disappointment. Never again