# Defaults to strict checking of required columns
source = GTFS::Source.build(<URI or Path to GTFS zip file>)

# Relax the column checks, useful for sources that don't conform to standard
source = GTFS::Source.build(<URI or Path to GTFS zip file>, {strict: false})

source.agencies
source.stops
source.routes
source.trips
source.stop_times
source.calendars
source.calendar_dates     
source.fare_attributes    
source.fare_rules         
source.shapes
source.frequencies        
source.transfers          

source.each_agency {|agency| puts agency}
...
source.each_transfer {|transfer| puts transfer}