On 24 Jan, 22:46, (Neil Williams)
wrote:
On Thu, 24 Jan 2008 22:15:23 GMT, "Jack Taylor"
wrote:

Which often doesn't - e.g. tonight, first train to Baker Street shown as
platform 3; *we all trooped down and got on and in came a Circle on 4 - and
left in front of us! Very irritating when the service is already cocked up
and is making you tight on time for an onward National Rail service.

I think it often only shows which signal is off, by which time it's
often too late.

The board is controlled from the signal computer at Baker Street. The
computer decides it's "moves" in advance, then updates the information
board. It then recalcuates the best moves and if it decides it's first
choice was wrong, changes them, but doesn't always update the board.
There is a project to upgrade both the board itself and the amount of
updates provided by the computer, but I haven't heard any news
recently as to when this will happen. From what I recall, the new
board will display the scheduled departure time of the the trains,
which should make life a little easier for regular customers to plan
which train to head for.