A conductor’s license may at any time be revoked by any licensing authority if that authority has reasonable grounds to believe that the holder of the license is suffering from any disease or disability which is likely to render him permanently unfit to hold such a license and where the authority revoking a conductor’s license is not the authority which issued the same, it shall intimate the fact of such revocation to the authority which issued that license:
Provided that before revoking any license, the licensing authority shall give the person holding such license a reasonable opportunity of being heard.