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Hello,
I was running this project:

https://github.com/coding-to-music/r-stringlines-nyc-mta-gtfs-train-visualization

And I saw an error using tidytransit with the MBTA GTFS feed, a new file fare_products.txt

#34

produces this error when running the R program:

# This may be unrelated, not sure:

Error in UseMethod("group_by") :
  no applicable method for 'group_by' applied to an object of class "NULL"
In addition: Warning message:

# This is the actual error:

In gtfs_to_tidygtfs(g, files = files) :
  Duplicated ids found in: fare_products
The returned object is not a tidygtfs object, you can use as_tidygtfs() after fixing the issue.

To fix, back up the zip file so you have an original copy:

cp MBTA_GTFS.zip MBTA_GTFS_original.zip

Now remove the offending file from the zip file

zip -d MBTA_GTFS.zip fare_products.txt

Now the file can be used as normal

I was able to produce many stringlines, after the fare_products.txt was removed
https://github.com/coding-to-music/r-stringlines-nyc-mta-gtfs-train-visualization/tree/main/stringlines

It looks like the zone_id the stop.txt file for Chelsea (CR-zone-4, should be CR-zone-1A) and Westborough (CR-zone-8, should be CR-zone-7) are incorrect.

gtfs_file: https://cdn.mbtace.com/archive/20190718.zip
Chelsea: https://www.mbta.com/stops/place-ER-0046
Westborough: https://www.mbta.com/stops/place-WML-0340