@organicmaps Is there a manual available? I'm happy to help, and I frequently edit OpenStreetMap, but I'm unfamiliar with how GTFS is supposed to work.
@organicmaps According to the OSM's wiki it seems I need to add gtfs:stop_id, gtfs:stop_name and uic_ref tags to the station node. The values can be found in the GTFS feeds (which I found via TransitLand). Easy enough!