The Parsons Brinckerhoff study didn't offer any estimate of the capital or operating costs of running the line to Secaucus.

WSJ: N.J. Subway Idea Lives

Under the proposal examined by Parsons Brinckerhoff, the No. 7 train would cross the river through two new tunnels and connect with the existing commuter rail station in Secaucus.

WSJ: N.J. Subway Idea Lives

The daughter of a PaineWebber managing director and a New York Post reporter, Sadik-Khan took Bloomberg's job offer after a stint in the U.S. Department of Transportation under President Clinton and ten years at international engineering firm Parsons Brinckerhoff.

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The route the Parsons Brinckerhoff study examined would largely follow the path that was to have been followed by the ARC tunnels, from Secaucus, through the Palisades, deep beneath the Hudson River and into Midtown, where it would connect with the future endpoint of the existing No. 7 subway, just below 34th Street.

WSJ: N.J. Subway Idea Lives

The city hired the consultant Parsons Brinckerhoff in early 2011 to study the merits of extending the subway, shortly after New Jersey Gov. Chris Christie canceled the planned "Access to the Region's Core" cross-river tunnel project, which was a blow to those who believe the region is hampered by the limited capacity for trains crossing the Hudson between Manhattan and the suburbs.

WSJ: N.J. Subway Idea Lives