Based on the world record nomination from Europe Records Institute (EURI) and Decision No.WK/USA.INDIA/908/2022/No.364, World Records Union (WorldKings) officially declared Metropolitan Railway as the “World's first passenger-carrying designated underground railway” on October 04, 2022.
The main line of this railway started from the capital's financial heart in the City of London and went north-west to what were to become the Middlesex suburbs.
Its first line connected the main-line railway termini at Paddington, Euston, and King's Cross to the City. The first section was built beneath the New Road using cut-and-cover between Paddington and King's Cross and in tunnel and cuttings beside Farringdon Road from King's Cross to near Smithfield, near the City.
It opened to the public on 10 January 1863 with gas-lit wooden carriages hauled by steam locomotives.
The 3.75-mile (6 km) railway opened to the public on Saturday 10 January 1863. There were stations at Paddington (Bishops Road) (now Paddington), Edgware Road, Baker Street, Portland Road (now Great Portland Street), Gower Street (now Euston Square), King's Cross (now King's Cross St. Pancras) and Farringdon Street (now Farringdon).
The railway was hailed a success, carrying 38,000 passengers on the opening day, using GNR trains to supplement the service due to overcrowding. In the first twelve months 9.5 million passengers were carried and in the second twelve months this increased to 12 million.
According to en.wikipedia.org, historyofinformation.com.