[Kon-Peki]

We have this same train set. The app that goes with it is pretty cool; you can set up a track in real life and then make the same track in the app, and it will follow along, with little mini games at certain spots, etc. The app train and the real life train stay in sync.

[Tempest1981]

Cool. What is the feedback mechanism to keep them in sync?

[Kon-Peki]

Bluetooth

[Tempest1981]

Are there sensors that tell the controller where the train currently is, on the track?

[Kon-Peki]

The train has a sensor (probably a very simple color sensor) on the bottom that can read the little marker pieces that you place on the track to trigger various functionality. It also knows the approximate speed.

It's a relatively inexpensive toy aimed at young children. You shouldn't expect too much from it.