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.
Given as a target, not a fixed date, per the pin description: "…after cancellations and cost overruns. Estimated date.…"
Official UK Department for Transport publication (May 2026 programme reset) gives the assured schedule range for Old Oak Common to Curzon Street as May 2036 to October 2039, superseding the pin's 2033 estimate; Transport Secretary Heidi Alexander has said there is 'no route' to a 2033 opening.[1]
The UK government's own 6-monthly report to Parliament states the "forecast date for initial HS2 services between Birmingham Curzon Street and Old Oak Common remains within the range of 2029 to 2033," an official but notably earlier range than the pin's stored 2036-2039 estimate, published November 2023.[1]
Something missing or wrong? Say it in your own words: a link that backs this pin up, a different start or end date and why, or a fact it lacks or gets wrong. The AI checks it against this pin's sources, searches for better ones, and adds any page that backs you up. The pin's own sources still count most.