Update 2026-01-29: A new test data set is available here: gtfs_fp2026_20260126_mit-frequencies_v2.zip
Due to user feedback on the planned adjustment to the frequency-based services, we have decided to postpone the publication of GTFS with frequencies.txt until 9 February. An initial test file (gtfs_fp2026_frequencies.zip) is already available, on 27 January we will publish a more up-to-date test file in the GTFS Cookbook link to frequencies.txt.
We apologise for the inconvenience, we underestimated the scale of the change. Thank you for your valuable and quick feedback!
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