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.
The Shanghai[2] municipal government's own English news page (19 March 2025) says "the project is scheduled to be operational in July 2027, offering seamless connections to high-speed rail, urban railway, metro lines, buses and the airport" - a month rather than a day, so the pin takes the last day of July 2027 instead of the end of the year.
The city government's later English news page narrows the opening from the bare "2027" of the 2023 page to a month: "the project is scheduled to be operational in July 2027". It is the operator-side source for the same milestone and is two years newer, so it fixes the pin to the end of July 2027 rather than the end of the year.[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.