On this day - 10 Jan 1863 - world's first underground railway from Paddington

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From TfL^» (Transport for London - about) a brief history of the underground

London Underground milestones
1863

On 10 January, The Metropolitan Railway opens the world's first underground railway, between Paddington (then called Bishop's Road) and Farringdon Street

And from the LT  Museum

The early underground was a huge engineering achievement and very well used, but had one big disadvantage: its steam locomotives created a permanent fug in the stations and tunnels. The only surviving steam engine from the 1860s, Metropolitan number 23, is on display in the Museum.