CONFIRMEDDate confidence: CONFIRMEDStated as firmHow firmly the source words the date: confirmed, scheduled, estimated, delayed or unverified.Show all CONFIRMED pins93% CONFIDENCEOverall confidence: 93%How well the pin's source and references back up its dates.Weighted average of how firmly 4 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
Happened as dated, per the source[1]: "The first phase of this new line, with three new stations on Manhattan's Upper East Side, opened on January 1, 2017."- Completion
- Jan 1, 201790% CONFIDENCEsource
Second Avenue Subway Phase One Opens as World's Priciest Subway
New York opened the first phase of the Second Avenue Subway, a century-delayed project that became the world's most expensive subway on a per-mile basis.
- Phase 1 of the Second Avenue Subway opened to passengers at noon on 1 January 2017, adding 72nd, 86th and 96th Street stations and about 1.8 miles of tunnel, served by the Q at all times and limited rush-hour N and R[3][4]
- It cost $4.45 billion, roughly $2.2 billion per mile, making it the priciest subway per mile[3][4]
- The line was first proposed in 1920; construction began in 1972, halted in 1975 by the fiscal crisis, and restarted in April 2007 (Eno dates construction from 2002)[3][4]
- The full line would run 10 miles and 19 stations from 125th Street to Hanover Square at over $24.7 billion; Phase 2 (96th to 125th Street, about $6 billion) began construction in June 2026[3][4]
- Eno noted phase two funding was unsecured in 2017, raised equity concerns, and said the new stations' elevators are wheelchair-accessible but slow[3]
Cost $4.45