London Mail Rail at the Postal Museum

A preserved Mail Rail train, part of London's Post Office Railway, is displayed at the Postal Museum. Opened in 1927, this driverless electric railway operated for over 75 years, transporting mail through a six-mile network of narrow tunnels beneath central London. The system was designed for efficiency, carrying up to 12 tons of post at speeds of 40 mph, bypassing surface congestion. Today, visitors can experience a restored section of this innovative 20th-century transport infrastructure, which stands as a testament to Britain's engineering prowess in urban logistics.