convert_shapes_to_sf    Convert 'shapes' table to simple feature object
convert_stops_to_sf     Convert 'stops' table to simple feature object
filter_by_route_id      Filter GTFS object by 'route_id'
filter_by_route_type    Filter GTFS object by 'route_type' (transport
                        mode)
filter_by_sf            Filter a GTFS object using a simple features
                        object
filter_by_shape_id      Filter GTFS object by 'shape_id'
filter_by_stop_id       Filter GTFS object by 'stop_id'
filter_by_trip_id       Filter GTFS object by 'trip_id'
get_parent_station      Get parent stations recursively
get_trip_duration       Get trip duration
get_trip_geometry       Get trip geometry
get_trip_segment_duration
                        Get trip segments' duration
get_trip_speed          Get trip speed
gtfstools               gtfstools: General Transit Feed Specification
                        (GTFS) Editing and Analysing Tools
merge_gtfs              Merge GTFS files
read_gtfs               Read GTFS files
remove_duplicates       Remove duplicated entries
set_trip_speed          Set trip average speed
validate_gtfs           Validate GTFS file
write_gtfs              Write GTFS files
