21C. Disqualifications for the grant of conductor' s licence.
No person under the age of eighteen years shall hold, or be granted, a conductor' s licence.
The licensing authority may refuse to grant a conductor' s licence-
if the applicant does not possess the prescribed qualifications;
if the medical certificate produced by the applicant discloses that he is physically unfit to act as a conductor; and
if any previous conductor' s licence held by the applicant was revoked.