You can ride this tiny Underground train in London that's not the tube

The Mail Rail, a historic 6.5-mile underground train line in London, functioned from 1927 until its closure in 2003 due to high operational costs.

Visitors can experience a 15-minute ride on the Mail Rail, organized by the Postal Museum, riding through original 100-year-old tunnels.

Adult tickets for a ride on the Mail Rail are priced at £17.60, while children's tickets are £10, with infants riding for free.

The Mail Rail was originally established to efficiently transport mail across London, but it was deemed inefficient in the modern context, leading to its closure.

Read at Time Out London