A free app for Android, by Aploft.
Subway 3D Moscow Simulator is a realistic subway simulator game where you drive a subway train in Moscow, Russia. The task is to deliver people from one stop to another stop, and make sure that you're delivering them in time.
The game is made in 3D and looks very realistic, and you can control the train with a steering wheel and other controls.
You need to be careful and make sure that you're not going to hit the other trains or the people, or you'll have to start again. You can also get help from other people on the train.
The game is made in a very simple and easy-to-understand way, so even the younger ones can easily play it.