References 585% CONFIDENCEOverall confidence: 85%How well the pin's source and references back up its dates.Weighted average of how firmly 5 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better
The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
- [1]90%youtube.com/watch?v=J8iKNhM3q7gyoutube.com· Posted Sep 15, 2026· Starts Jan 10, 1863 ✓· 23% of score
The London Transport Museum and Britannica[4] both date the Metropolitan Railway's opening between Paddington and Farringdon to January 10, 1863.
- [2]95%When did the first underground railway open? – London Transport Museum
Opened primary project source for sourced buildout metrics and project timeline; researched 2026-10-29.[1]
- [3]80%en.wikipedia.org: cost of Metropolitan Railway Opens the World's First Underground Lineen.wikipedia.org· Added Oct 24, 2026· 27% of score
Final cost of the first line (estimate had been £1m).[1]
- [4]75%Metropolitan Railway - Britannicabritannica.com· Added Sep 15, 2026· 23% of score
Britannica independently corroborates the January 1863 opening date and Paddington-Farringdon route.
- [5]90%World's first Underground - London Transport Museumltmuseum.co.uk· Published Jan 10, 1863· 0% of score
The London Transport Museum's own history dates the Metropolitan Railway's opening to January 10, 1863, the same event and route the documentary narrates.[1]
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