With distributed transmission, the signal is delivered to each of its transmitters via fixed channels (land-based delivery).

ENGADGET: blogger-avatar

It didn't get off to the best of starts as at 07:30 BST the Central Line had a signal failure and had to be part-suspended while engineers fixed it.

BBC: Olympic transport coping despite Tube delays

Still his father said nothing, his eyes fixed on the view like a soldier on guard duty, determined not to miss the signal flare sent up by a savage tribe on a distant hill.

NEWYORKER: Town of Cats