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DALLAS (CBSDFW.COM) – A Dallas City Council meeting about DART’s plans to run a rail line from Plano to the Dallas/Fort Worth International Airport was packed Monday night.

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The line would run through Dallas, and Mayor Mike Rawlings was there to discuss plans for a new subway in his city.

Rawlings is planning for the future, even as some city council members said the past could bankrupt Dallas. They’re concerned about a 20-year-old lawsuit involving police and firefighter pay that’s heading for court soon.

“You’re looking at if the city were to lose that pay lawsuit, I think the potential to bankrupt the city is there,” said City Council Member Lee M. Kleinman.

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Councilman Kleinman said if the city loses, it could have to pay between $2 and $3 billion dollars in back pay.

“You would look at caving the city’s ability to even operate,” said Kleinman. “you could not tax enough to our residents to even pay those lawsuits.”

Mayor Rawlings has said the city won’t settle the lawsuit.

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