Overview. Mountain Transit Authority is hiring full-time and part-time bus operators in the Greenbrier County area. If hired for a full-time position, we offer health insurance, dental, vision, paid personal leave, and retirement. Class C CDL with passenger endorsement or Class D License is required. If hired with a Class D License, the applicant must get their Class C CDL with passenger endorsement withing 90 days of hire. Must be. 21 years old....