Generalize the simulator to work with an GTFS files

[xcwisc]

Other cities to consider

• Indianapolis
• Minneapolis
• Milwaukee

This to consider

• Calendar.txt is a mandatory requirement for the simulator, but it is not a mandatory aspect of a GTFS (example: Indianapolis’s gtfs file does not contain a calendar.csv file, but their gtfs is considered valid and complete according to official specifications https://developers.google.com/transit/gtfs/reference/#calendartxt). Note that this is because their route.csv file does not have a service_id column. Instead, their trips.csv file contains the service_ids in the form of “ABCD-Saturday”. They vary by [‘Weekday’, ‘Saturday’, and ‘Sunday’]

Potential tools to use

https://mrcagney.github.io/gtfs_kit_docs/