Thanks for getting back to me. In the meantime I converted the transfers.txt from the HRDF tables myself. Still, I urge to include it in the feed.
Now, I've came across another problem. It seems to me that the weekdays in the calendar.txt are incorrectly set. I think you shifted the input dates (according to the Verkehrstagenummer in the *A VE rows in FPLAN and the corresponding entries in BITFELD) by two days.
You can check this with the following example: service_id = "TA+b01qc" and respective trips, e.g. "1.TA.21-819-j17-1.1.R" or "1.TA.21-822-j17-1.1.R".
The service_id in the calendar.txt says that those trips are provided tuesday through sunday, but in fact they are provided monday through friday.
Here's the respective extract of calendar.txt:
The two sample trips I mentioned are 1) Kartause Ittingen - Frauenfeld, Bahnhof starting at 06:58 and 2) Oberneunforn, Gemeindehaus - Frauenfeld, Bahnhof starting at 05:58. sbb.ch states correctly for both of the mentioned sample trips: runs Mo - Fr.
Could you please verify whether my findings are valid and possibly provide a rectified calendar.txt? Thanks for taking the time to study my suggestions!