trip_id,start_time,end_time,headway_secs
2017B111,06:00:00,09:00:00,300
2017B111,09:01:00,15:00:00,900
2017B111,15:01:00,21:00:00,300
2017B110,06:00:00,09:00:00,300
2017B110,09:00:00,15:00:00,900
2017B110,15:01:00,21:00:00,300
