How does WiFi work onboard?

To keep you connected throughout your journey, we combine 3G and 4G mobile network coverage with station wireless internet connections. Each user is limited to using 100MB of 3G and 4G mobile network data each day. However, whenever a train is at a station, our trains connect to the station WiFi. Only when the train pulls away from the station or is in between stations will the train use 3G and 4G. Therefore our customers can typically expect to experience more than 100MB of data during their journey.