From Frankston there is a diesel locomotive service to Stony Point . It is a short walk along the jetty to catch the passenger ferry to Tankerton jetty on French Island . Catch a train on the Frankston railway line to Frankston station ; change trains to catch a diesel locomotive service on the Stony Point railway line to Stony Point , where it is a short walk along the jetty to catch the passenger ferry to Tankerton jetty on French Island .