Dallas City Council members are growing tired of waiting on Arlington and Grand Prairie to make a decision that would give the mid-cities a stop on a future high-speed rail line between Dallas and Fort Worth.

To earn a station on the proposed rail line, officials have said that a city would need to join either the Fort Worth Transportation Authority, now known as Trinity Metro, or Dallas Area Rapid Transit.

Lee Kleinman, chair of the council's mobility solutions committee, said Monday he wants at least one of the cities to be a part of the system. But he wants to move ahead with an agreement.

"Clearly, it's a signal to Grand Prairie and Arlington: We're moving forward and we're not waiting on them," Kleinman said.

Committee members Sandy Greyson and Rickey Callahan also said they'll be fine with moving ahead without Arlington or Grand Prairie and bringing those cities aboard once they make a decision.

But Michael Morris, the North Central Texas Council of Governments' transportation director, said Arlington is poised to meet the transit requirement. Morris had previously said Arlington and Grand Prairie need to join "the big leagues" and commit to transit.

Both agencies require members to pony up some sales tax revenue to become full members. DART is a full cent and Trinity Metro is a half cent. But both Grand Prairie and Arlington have sales tax dollars tied up in other endeavors such as sports stadiums.

Morris said "everything is coming together nicely." But he did not know exactly what Arlington was planning to do. A spokeswoman for Arlington Mayor Jeff Williams said he was not available for comment.

Laura Hanna, a spokeswoman for Trinity Metro, said in an email that the agency's officials "have had discussions, but we don't have any details to report at this time."

DART spokesman Morgan Lyons said Arlington officials haven't talked with the transit agency for about a month. Lyons said Arlington's mayor told DART then that the city might want to "do something at some point," but was interested in seeing how the its new partnership with Via, an on-demand ride service, played out.

It's also unclear how the high-speed rail line will come to fruition anyway. The proposed line -- somewhat duplicative of the slower Trinity Railway Express -- would connect to a proposed Dallas-to-Houston high-speed rail line and possibly an Oklahoma City-to-Laredo line. Morris has said he also hopes to have a connection to Dallas/Fort Worth International Airport.

Texas Central Partners is trying to build the Dallas-to-Houston line with private money. The group recently announced it plans to build a station near the Kay Bailey Hutchison Convention Center, but has other hurdles to clear and detractors who are fighting it.

Dallas officials also want the North Texas connection to be privately funded, but the line doesn't have anyone's backing yet. Dallas, Fort Worth and the North Central Texas Council of Governments are developing a local government corporation, known as an LGC, to manage the project.

Callahan, who represents Pleasant Grove, said he tires of Dallas footing the bill for public transportation while other cities benefit directly or indirectly from the system and the spending. Arlington and Grand Prairie "should've been thinking about (transit) 30 years ago or 5 years ago," Callahan said.

"So I would like to see some level of contribution there for sure."

Update: This story was updated at 9:53 p.m. to reflect that the Fort Worth Transportation Authority, long known as the T, now goes by the name Trinity Metro.