HC Deb 12 April 1989 vol 150 c566W
Mr. Cohen

To ask the Secretary of State for Transport what consideration has been given to the age and adequacy of current radio communications between drivers and guards on Central line underground trains; and if he will make a statement.

Mr. Portillo

Communication between driver and guard on the Central line is by "Loudaphone". This is a microphone and loudspeaker system, operated by a push button, which is built into trains. The railway inspectorate is investigating reports of poor quality voice transmissions. As an added safety measure, the driver is also in radio communication with the line controller.