Okay great information. The part about the subway still being in osm is what I was confused about. I can update.

(I assume) due to the removal of a seperate listing for the 1990s platform to the west, the entire city of Louisville lost the 'LVL' station code on the national map. I have added the train station tag to the union station building, but trains=no, to try to help communicate that no trains serve this. It is however still served by greyhound, bookable through amtrak with the station code LVL.

Hi! Yes, I was afraid this might happen. I've never been the best on tagging and from what I read on the wiki, this seemed to be proper. I see the issue though. I only wanted to add them as they then show in Open Railway Map. I actually have pretty extensive knowledge of the subway, I've done research on it for both school and personal projects. Sorry if this is a dumb question, but do you know if there should be no historical data in osm? As the Cincinnati Subway is mapped here, but you say not in Open Historical Map, should all historical information go into Open Historical Map and would thing like Open Railway Map pull from Open Historical Map?

While the preferred method of determining classifications may be via the number, when represented visually in the public map, roads appear very different than which they actually are. In this example, 74a appears visually as a 4 or 6 lane highway, when in reality, it is a narrow, winding, country road in many places, and not greater than 1 lane in each direction for the entire length I have corrected. In first article in which you have linked, the notice at the top states "These guidelines have been adopted by contributors in certain states as described in this article and represents the consensus view that highway classification is based on a road's topological importance in the long-distance road network."