London Underground gets online departure boards

I just received an email from Transport for London, making me aware of its new online departure boards service for the Tube.

I have to say, it may work well but I can't see the point, unless you're hanging around outside a Tube station having a cigarette, wondering when you can steal that last puff.

Otherwise, you'll be out of mobile broadband coverage. In any case, the Tube is a fairly regular beast.

Am I missing something? Will anyone find this seriously useful?