Invalid route type caveat

[r-leyshon]

Description of the Feature to be Added

For route type == 200, can we include some text at the top, explaining that the message from gtfs_kit is not helpful, and that the route_type 200 is part of the proposed extended schema that they do not recognise? I think it’s worth doing though not super urgent as anyone using this is likely to encounter this route type in their GTFS.

(OPTIONAL) Suggested Implementations

some text at the top of the table when the issue is about route type 200 (coaches)

Additional context