The most expensive subway ever built
Phase 1 of the Second Avenue Subway cost $4.6 billion to build 2.7 kilometers of tunnel and three stations. At roughly $1.7 billion per kilometer, it is the most expensive subway ever constructed — five to twenty times the cost of comparable projects in Europe. Here's how it happened.
Two timelines
New York spent 10 years and $4.6 billion building 2.7km. Madrid built 56km in 3 years for $2.8 billion.
First proposed
A Second Avenue line is included in early city plans for subway expansion.
Formally planned
Included in the IND Second System — a massive expansion that will never be built.
Construction briefly starts
Ground is broken in three locations. Work halts almost immediately as the city's finances collapse.
Fiscal crisis kills the project
New York City's near-bankruptcy puts the subway on ice for a generation.
Planning restarts
A new environmental review begins — 80 years after the line was first proposed.
Construction begins
Phase 1 (96th to 63rd Street) finally breaks ground. Budget: $3.8 billion.
Original opening target
The project was supposed to be done. It was not. Budget has grown to $4.5 billion.
Emergency acceleration
Governor Cuomo personally intervenes, paying contractors $66M in overtime to force completion.
Phase 1 opens
Three new stations open at 72nd, 86th, and 96th Streets — 98 years after first proposal. Final cost: $4.6 billion.
Expansion commissioned
The Madrid regional government commissions a plan to dramatically expand the metro system.
Construction begins
Work starts simultaneously on 40km of new lines and 37 stations. Budget: ~$1.7 billion.
First phase opens
40km of new track and 37 stations open — just three years after construction began.
Airport extension opens
A 12km extension to Barajas Airport is completed.
MetroSur opens
A 41km circular line connecting five southern suburbs opens. Total expansion: ~56km.
Cost per kilometer
How New York compares to other major transit projects (2020 dollars).
All figures in 2020 USD. * Crossrail includes mainline rail infrastructure and is not a direct metro comparison. † Madrid figures include ~18.5km of above-ground track, which lowers the per-km average.
Why did it cost so much and take so long?
Four structural problems identified by the Transit Costs Project at NYU Marron Institute.
Bloated station design
Stations account for the vast majority of Phase 1's cost. NYC's station boxes are 150–260% larger than the actual passenger space — with enormous back-of-house rooms demanded by different MTA departments. Madrid's stations had virtually no excess space.
Labor costs & staffing
Labor in NYC consumes twice the share of construction costs as in Europe (19–31%). A tunnel boring machine that requires 30 workers in Istanbul required 46 in NYC. A launch box that took one year to build in Madrid took three years here.
Consultant overload
The MTA gutted its in-house engineering capacity over decades, replacing staff with expensive outside consultants. The design contract alone grew from $187M to $452M. Internationally, soft costs run 5–10% of construction; in NYC they hit 21%.
Procurement failures
Unusual risk allocation — MTA placed geological risk on contractors instead of absorbing it — drove away bidders and inflated prices. The main tunneling contract received only two bids. Contractors hedged uncertainty by pricing in 15–40% contingencies.
What can we do about it?
Essays on what needs to change — and how.
How to Stop New York from Overpaying Private Construction Companies
Curing the city once praised for building of its public procurement problem…
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