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Here are some of the things that put the Silver Line $150 million over budget

The Greensboro station on Metro’s new Silver Line looking east along Leesburg Pike. (Jahi Chikwendiu/The Washington Post)
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Experts say that being $150 million over budget on a $2.9 billion project isn’t that bad. But we know for members of the public — who are footing the bill — staying within budget matters.

In our recent story, we chronicled how Dulles Toll Road users, once responsible for 25 percent of the costs of building the Silver Line, are now paying 49 percent of the bill. After five straight years of toll increases, you can bet they’re watching the project’s bottom line.

For those who are curious, here are some of the items that put the Silver Line $150 million over budget with still more bills to come. For more detail, check out Dana Hedgpeth’s original 2011 story on the overages.

  • Changes in the project’s design and related delays: $20.2 million
  • Relocation of utility lines (everything from telephone to cable): $44.5 million
  • “Safety and reliability” changes requested by Metro: $49.3 million
  • Additional electrical substations along the tracks to ensure reliability. Two substations and a system to monitor them added: $28 million
  • Redesign of West Falls Church rail yard: $5.7 million
  • Upgrading emergency warning light system the alerts train operators when a track worker is on the line: $7.5 million
  • Switch from wood track ties to concrete ties: $3.3 million

The Metropolitan Washington Airports Authority, which is overseeing construction of the rail line will meet Wednesday. The agenda will include an update on the Silver Line rail project. I’ll be live tweeting (@loriara) highlights from the meeting so feel free to follow along.