Emergency communication system
On the day of the London Subway Bombings, mobile phone networks, including Vodafone, reached full use and were not available by 10:00 a.m. (which was only about an hour after the bombs exploded). Because of a very old radio system, the damaged trains were not able to communicate with the "Transport for London" control center or emergency workers. Emergency services managers, of the London Ambulance Service for example, had to depend on the already unavailable mobile phone network because there were not enough digital radios. The Access Overload Control (a special emergency plan also known as "ACCOC"), which was used only in a 1km area around Aldgate Tube Station, was not helpful because many of the emergency workers did not have phones that could work with ACCOC. After the bombing, the London Assembly decided that there needed to be a digital radio communications system in London that could work underground.