On Dec 2, 6:55 am, "Clive D. W. Feather" cl...@on-the-
train.demon.co.uk wrote:

You still need to fit the cameras and the wiring. All it saves is the
cost of the monitors, but at the expense of a transmission system.

The Northern and Central Lines have this, but that's mostly because
there's no room to retro-fit the monitors in tube stations.

Jubilee Lines stock does as well.

--
Nick