SulFertagus GTFS (General Transit Feed Specification) data regarding Fertagus shuttle buses in the south bank of the Tagus river. Components: agency.txt: Baseline information about Metropolitano de Lisboa, including the agency's name, website URL, and timezone. routes.txt: Defines the transit routes. A route is a group of trips that are displayed to riders as a single service. It includes the route's ID, name, type, etc. trips.txt: Defines individual trips for each route. A trip represents a journey made by a vehicle along a route at a specific time. This file links the routes to the calendar scheduling and the physical shapes. stops.txt: Defines the individual locations where vehicles pick up or drop off passengers. It includes the precise latitude and longitude coordinates for each stop. stop_times.txt: Lists the exact arrival and departure times for a vehicle at individual stops for every trip defined in trips.txt. calendar.txt: Defines the regular weekly scheduling. It specifies which days of the week (Monday-Sunday) a particular transit service operates, using "service IDs", along with the start and end dates for that schedule to be valid. calendar_dates.txt: Defines exceptions to the regular schedule found in calendar.txt. For example, it dictates if a service is cancelled on a specific holiday, or if a special extra service is running on a unique date. shapes.txt: Defines the physical, geographic paths that vehicles take on their routes. It consists of sequences of GPS coordinates, enabling maps to draw the exact path the vehicle travels instead of just straight lines between stops. frequencies.txt: Used for services that run at regular intervals (headways) rather than strict fixed timetables.