Quote:
Icomera, the company providing the wireless connections, is based in Gottenburg, Sweden where it recently introduced Wi-Fi on Linx trains running between Gottenburg and Copenhagen. Roll-out on trains serving Oslo-Karlstad-Stockholm is scheduled for later this year.
Crucial to the success of Wi-Fi on high-speed trains is the delivery of a reliable wireless connection through a number of systems, according to Current Analysis. Icomera uses multiple GPRS, GSM and satellite links to deliver Internet access on trains going at speeds of up to 200km per hour. The company has also collaborated with train operators, manufacturers and regulators to ensure its solution meets industry standards
GNER has conducted trials to find out what the quality of the GSM network is like along the east coast rail route from London to Inverness, according to Current Analysis' report, which concluded that coverage was 98 per cent.
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It seems it's a combination of satellite and then GPRS/GSM when it can't get a satellite.