timeframe_group_id,start_time,end_time,service_id
weekday_evening,21:30:00,24:00:00,weekday_service_R
weekday_late_night,00:00:00,05:00:00,weekday_service_R
weekday_regular,05:00:00,21:30:00,weekday_service_R
weekend,00:00:00,24:00:00,weekend_service_R
