[dowlingm]

http://www.railwaygazette.com/index....he=1&tx_ttnews[tt_news]=14896&cHash=c3c9247faf77b8c536faab7b322e3767

French telecoms operators will extend their 2G and 3G coverage through the south running tunnel (generally used by France - UK trains) from July 2012. The north running tunnel will be covered by UK operators at a later date.

I wonder if there were technical reasons to delay the change to a roamed environment until out of the tunnel at each end.

[KevR]

They did trials on the London Underground but found there wasn't enough room between the trains and tunnel walls to bounce a reliable phone signal. They are going to settle for Wifi enabled ticket offices and platforms instead.

There is probably more space between the Channel Tunnel and the trains that pass through it so it is possible (but not straightforward).

[Trick of the Tail]

I don't see why the distance would be a problem, if they used a leaky feeder system.

A.