The on-duty station agent called in to report a male subject who had jumped into trackway two. The male subject walked into the Richmond Yard and boarded an out-of-service train. The out-of-service train was brought back into the station platform where the subject off boarded. The subject eventually exited the station where he was contacted by an officer. The subject became confrontational and the officer used de-escalation techniques to keep the subject under control while other officers were responding to assist. The subject was found to meet the criteria for an emergency psychiatric evaluation. The subject was transported to the hospital for evaluation. TSOC notified.