With the remarkable acceleration of the railway, the coding technique within the station was widely applied as abasic technical equipment for train safety.
Captain Jerry Roberts, the last of the British codebreakers to help decipher communications between Adolf Hitler and his top generals during the Second World War, has died at the age of 93.Gordon Corera reports.
Signals in Morse code were firing back to London from all over the Empire, helping the government to keep a watchful eye on the Colonies and keeping British merchants ahead of the competition.