An adult male approached the station agent at Colma station asking to be let in for a free ride. When the agent refused, the subject threatened to rob someone and brandished what appeared to be the butt end of a handgun. The subject fare evaded and boarded a train, exiting at Daly City station where he was apprehended after a short foot chase by Daly City PD. The suspected handgun turned out to be a facsimile which he tossed while being chased. It was later recovered. The subject was booked on the above charges.