A single PMTiles file created from all active GTFS data from Mobility Database Catalog from Mobility Data.
This is a work in progress. Data will be updated.
https://protomaps.github.io/PMTiles/?url=https%3A%2F%2Fdata.source.coop%2Fsmartmaps%2Fmobility-gtfs-pmtiles%2Fmobility.pmtiles
Downloading and conversion script is at https://github.com/optgeo/mmx-gtfs.