[2] The Grey Line intercity service (route 29) operates from Bridgeport in neighboring Harrison County to Grant Street Transportation Center in Pittsburgh, Pennsylvania, with intermediate stops in Fairmont; Morgantown; Waynesburg, PA; Washington, PA; and Pittsburgh International Airport.

[6] Monongalia County discontinued much of its funding for transit service in 2016, following a decrease in coal severance tax receipts.

[8][9] The agency faced further challenges in 2018, when local non-emergency medical transportation provider In Touch and Concerned Inc. went out of business.

In Touch and Concerned was formerly a partner of Mountain Line, but stopped using space in the agency's facility in Westover after it expanded services.

[12] WVU closed the PRT system for over a year beginning in March 2020, instituting its own substitute bus service.

Mountain Line service continued, paralleling the PRT and providing additional options to WVU students.

[13] Also in 2020, a second property tax levy was passed by Monongalia County voters, providing dedicated funding for Mountain Line services.