 To become one of the city's roughly 7,000 licensed Boston Hackney Carriage Drivers one must report to the Hackney Carriage Unit at Police Headquarters, located next to the Ruggles T station on the Orange Line.The applicant must produce documentation that he/she is legally eligible to work in the United States and must have had a Massachusetts driver's license for a minimum of one year.In addition, Hackney Officers will run a Criminal Records and Massachusetts Registry of Motor Vehicles check on the applicant.