Mail Rail at The Postal Museum

Deep beneath the bustling streets of London lies a secret world that once served as the central artery of the British postal system. For seventy-six years, a driverless electric railway known as Mail Rail moved millions of letters and parcels through a network of tunnels nearly seventy feet underground. Built to bypass the chaotic street traffic of the city, this engineering marvel operated almost continuously for twenty-two hours a day, keeping the capital connected long before the age of digital communication.