Silent trains?

The Economist has a brief article about train operator C2C in London offering mobile-free phones by coating the phones in an RF-absorptive material. Basically it prevents cellular signals from getting into or out of a train car, and by doing so guarantees silence in the cab.

It's a little heavy-handed for a few reasons, though. Firstly, blocking RF transmission will just put phones into a wildly-seeking-signal state, meaning that many people will end their journeys into London or on their way home with batteries that have been drained more than they ought to. Also, it prevents people from using otherwise silent data services (eMail, SMS, web, etc.).

What might be a better solution? Well, yes, coat the trains such that they don't let phones connect to external base-stations. Then go ahead an put in picocells inside the train cars themselves, or repeater-like technology that Orange and Virgin have already deployed. Allow these systems to only allow services to work on the data channel, and you're done...

And the revenue model? Whoever owns these picocells can charge the operators for allowing their customers to use them. Not an unreasonable "roaming" charge, of course, but something akin to the charge operators charge for terminating calls on their networks, perhaps.

And what's next? Deploy this in the tube. In fact, wouldn't this be a great project for TfL to own, both on commuter rail and in the tube?