In Japanese superpoezda put Wi-Fi

The Company Central Japan Railway, high-speed trains which run between Tokyo and Osaka, is going to introduce a wireless service in all the compositions of the new series N700. It is expected that the first access point will be installed in them in 2009.
Since the train is moving very fast access to the network will be carried out not over the air, and through a special coaxial cable laid along the routes, such as those that are already used to transmit conventional radio signal between the train and ground stations. However, unlike the currently used analog systems, the new use will have a digital signal.

Source:. http://www. internet. ru / index. php? itemid = 14743.