For example, this stop time:
75R10,24:02:00,24:02:00,PLZA,3,Warm Springs/South Fremont,,,,1
...cannot be found by this visits_between query:
timetable.visits_between("PLZA", "20170728 00:00:00", "20170728 00:30:00", 5)
This is because we start searching at day of the requested time.