A male suspect fare evaded thru the emergency gate to exit the Castro Valley Station. Officers stopped the male in the bus zone and a records/warrant check showed the male had a $7,500 warrant for theft issued by Pacifica PD. The agent responded to the station and placed the male under citizen's arrest. The male was cited on the fare evasion and was booked on the warrant at Santa Rita Jail. The arrest was approved by an OIC.