DENVER (CBS4)– The future of RTD commuter rail lines may be in question after its private business partner claims there is no solution to a lingering problem.

In a letter to RTD, Denver Transit Partners said the crossing gate timing issue won’t be fixed by the deadline.

READ MORE: Colorado State Trooper Hit On I-70: 'This Has To Stop'

(credit: CBS)

Denver Transit Partners is made up of the group of contractors who built and maintain the A Line, B Line and the future G Line. At issue, the crossing gates that must be manned 24 hours a day, seven days a week, because of a computer glitch.

RTD insists the letter from Denver Transit Partners is more of a protest than anything.

“The concessionary agreement we have with Denver Transit Partners is highly complex,” said RTD spokesman Scott Reed.

RTD spokesman Scott Reed (credit: CBS)

The crossing gate technology does not comply with federal regulations. The gates lower too early and stay down too long.

In the letter, Denver Transit Partners tells RTD that with no improvement in sight, they want to negotiate its contract with RTD and wants to stop being fined for problems that cannot be controlled.

READ MORE: More Law Enforcement Agencies, Businesses Accepting Colorado Digital ID

RELATED: Major Light Rail Closure Planned For This Weekend

The letter states no work has been done to improve the issues with the crossing gates since February.

(credit: CBS)

“RTD is in the process of reviewing the notice that was provided,” said Reed.

The letter also states the rail lines have been a test track for state and federal regulators, but in return the lines have never been given full accreditation.

“We believe we are moving forward,” said Reed.

MORE NEWS: Gabriel Samora Accused Of Shooting 2 People Near Denver's Capitol Hill Neighborhood

In October 2016, RTD told CBS4 that it hoped the train crossings would be fixed and quiet zones would be established by the end of the year.