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Here’s what a Broad Street Line extension to the Navy Yard could look like

The biggest obstacle may be qualifying for needed federal funding. Buildings costs range from $869 million to $1.6 billion.

A SEPTA Broad Street line train leaves City Hall station.
A SEPTA Broad Street line train leaves City Hall station.Read moreDavid Maialetti / Staff Photographer

SEPTA pitched three proposals on Thursday to extend the Broad Street Line to the Navy Yard, but the long-percolating project faces a hefty price tag and a hard road to win funding.

The price tag for the cheapest of the options is $869 million, and the other two are $1.5 billion and $1.6 billion. Under current ridership projections, the project wouldn’t qualify for needed federal funding. Also, it is possible better transit around the development could be achieved with buses at much less cost.

“We understand that the ultimate transit connection to the Navy Yard is the railway,” said Liz Smith, SEPTA’s director of long-term planning. “But if we can’t find [funding], we can’t do it.”

A Broad Street Line extension has been on Philadelphia’s wish list for years. A 2014 report on transportation access to the site predicted that engineering could begin this year. The expected price tag was much smaller — up to $400 million — at a news conference in 2015 in which Mayor Jim Kenney, U.S. Sen. Pat Toomey, and recently indicted union boss John J. Dougherty all threw their weight behind an extension. At that time, construction was predicted to begin by the end of this decade. The project has not progressed much since then.

>>READ MORE: Many ‘ifs’ for train to Navy Yard

The Broad Street Line’s southern terminus is NRG Station, near Philadelphia’s sports complex, about a mile and a half shy of the Navy Yard, which is home to 160 employers and 13,000 workers, and is still growing. The 1,200-acre site is projected to eventually sustain 13.5 million square feet of development and 30,000 people.

Now, shuttle buses ferry workers throughout the site but run only every 20 minutes, which is not as frequent as workers would like. The Broad Street Line has seven-minute headways much of the day.

On Tuesday, the Philadelphia Industrial Development Corp. (PIDC) approved $416,280 to be spent to run shuttles to the Navy Yard every 10 minutes, said Prema Katari Gupta, a senior vice president at PIDC. SEPTA also recommends eventually splitting the existing shuttle into two routes, one serving the western half of the Navy Yard campus and the other the eastern half.

The long-term goal, though, is a subway extension. “We want to make the ride to the Navy Yard as easy as possible,” Gupta said. “And also send a message that the Navy Yard is an integrated part of the city.”

The cheapest of SEPTA’s three extension options would run the subway line along Rouse Boulevard. The other two options would provide service deeper into the campus. All three would rely on enhanced bus service to connect riders with the rest of the campus. More details are expected by the end of February.

Creating a subway extension — the city’s first tunneling since the 1970s — would be an enormous undertaking likely to occupy three to five years. The Rouse Boulevard plan, which proposes one new station on the Broad Street Line and is SEPTA’s preference, would be a little more than a mile long. The two other alternatives, which each would add two stops to the line, would be just shy of two miles long.

SEPTA would have to invest in a tunnel boring machine, a massive piece of equipment that would be inserted through a pit near NRG Station and would burrow close to seven feet below sea level. It would go beneath I-95, Broad Street, and a freight rail line used by CSX, and would link to unused tracks directly beneath the active NRG Station platform, said Devin Plantamura, a track design engineer with the contractor HTNB. Stations, meanwhile, would be carved out with digging from the surface.

A 2014 survey found that 44 percent of the workers at the Navy Yard drive to their jobs, and at the open house some said a better public transit option would be welcome.

A train “might make it marginally better,” said Matthew Eayre, who drives to his job with the GBS Group in the Navy Yard from his Bucks County home. “As long as the parking is free down here, it’s going to be hard to compete.”

>>READ MORE: Navy Yard hits 10-year mark in stride

Ridership projections for the subway extension, which SEPTA did not have available Thursday, aren’t high enough to meet the standards for federal funding. Grants take into consideration whether there is a residential development near a project, and the Navy Yard has none.

Typically, federal funding will cover half the costs of a major infrastructure project like the extension. The rest of the money would likely come from state and local contributions, said Chris Puchalsky of the city’s Office of Transportation, Infrastructure, and Sustainability.

A change in commuting habits and more development at the site, including residential units PIDC says are coming, could boost ridership projections to meet federal requirements.