https://github.com/gravitystorm/openstreetmap-carto/issues/5050 is why there is no way to keep the tunnel below the building.

Why would 651 be out of sequence, even if it wraps around the corner?

the border is a straight line. it does not follow the twisty road. consult any official map to see.

Amtrak trains heading westbound use this track.

Oddly currently both east and westbound are mapped as using the same single track to the south.

We note the density of street names shown on the map.

It's like nowhere else on OSM.

Seems like some kind of hack, where segments of streets are purposely disjointed or something.

Are you sure there really is a mountain at this point. It looks just like some average high place on the side of a real mountain. Also the name has a little bit of suspicion in it.

All I know is both the name and ref get rendered, causing repetition to appear on the map when zoomed in. I don't know the best solution.

North / south segments would be avenues.
https://en.wikipedia.org/wiki/Burkle_addressing_system

Indonesian language place name?