Initially the term was used to apply only to steamship routes (as these were the only practical way of carrying communications between Great Britain and the rest of the Empire), particularly to India via the Suez Canal - a route sometimes referred to as the British Imperial Lifeline.
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In the 1880s the term "All-Red Route" was expanded to include the telegraph network (see All Red Line) that connected various parts of the Empire, and by the 1920s it was also being used in reference to proposed air routes, initially airship and then flying boat, between Great Britain and the rest of the Empire, see Imperial Airship Scheme.
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