feed_contains           Returns TRUE if the given gtfs_obj contains the
                        table. Used to check for tidytransit's
                        calculated tables in sublist
feedlist                Dataframe of source GTFS data from Transitfeeds
filter_stop_times       Filter a 'stop_times' table for a given date
                        and timespan.
filter_stops            Get a set of stops for a given set of service
                        ids and route ids
get_feedlist            Get list of all available feeds from
                        transitfeeds API
get_route_frequency     Get Route Frequency
get_route_geometry      Get all trip shapes for a given route and
                        service.
get_stop_frequency      Get Stop Frequency
get_trip_geometry       Get all trip shapes for a given route and
                        service.
gtfs_as_sf              Convert stops and shapes to Simple Features#'
gtfs_duke               Example GTFS data
plot.gtfs               Plot GTFS object routes and their frequencies
raptor                  Calculate travel times from one stop to all
                        reachable stops
read_gtfs               Get and validate dataframes of General Transit
                        Feed Specification (GTFS) data.
route_type_names        Dataframe of route type id's and the names of
                        the types (e.g. "Cable Car")
set_api_key             Set TransitFeeds API key for recall
set_date_service_table
                        Returns all possible date/service_id
                        combinations as a data frame
set_hms_times           Add hms::hms columns to feed
set_trippattern         Add trip pattern data frame to the gtfs object
shapes_as_sf            Convert shapes into Simple Features Linestrings
stops_as_sf             Convert stops into Simple Features Points
summary.gtfs            GTFS feed summary
travel_times            Calculate shortest travel times from a stop to
                        all reachable stops
write_gtfs              Writes a gtfs object to a zip file. Calculated
                        tidytransit tables and columns are not
                        exported.
