pounds 40m bus fleet starts to roll out.
Up to 175 high-spec single and double-deckers will be fully operational by next April, with almost half of them in rural areas.
The vehicles are fitted with digital CCTV, child safety cameras, magnetic emergency door locks and seat-belts.
A total of 80 of the new buses will serve the countryside while 25 double deckers will run on key routes in Belfast.
Translink acting chief executive Philip O'Neil described it as "a further milestone" in Northern Ireland bus services.
Minister for Regional Development Conor Murphy said he wanted to steer commuters away from using their cars.