[harry-wood]

If you can pinpoint the data in OpenStreetMap we could try to figure out if this is something wrong in the map data (Anyone can fix it!), or maybe it's a tag they should be filtering out on the OpenRailwayMap rendering.

[qwezxcrty]

Hmmm, the specific case I was looking at is the North extension of Nanchang Metro Line 1 to 昌北机场. Which doesn't exist yet.

I'll also have a look myself tomorrow.