text: Hi, I originally created way #247826885, so I'll explain.
  
  railway=abandoned is for mapping the location of former rail routes when tracks no longer exist, but some feature of it is still visible (such as when it has been reused as a path, cycleway, busway, or a bridge or cutting is still there). This tag will not show anything on the Mapnik maps displayed by openstreetmap.org.
  
  The Way is marked psv:guided=only to indicate only guided busses are allowed, but Mapnik doesn't display anything for this tag.
  However, the underlying openstreetmap database is correct, and the data should not be changed just because one renderer (Mapnik) doesn't display it perfectly - Mapnik may be improved over time, and other renderers may well get it right now. Applications such as SatNav will know not to direct vehicles along it.
  
  One change that should be made is to show it as a dual carriageway bus_guideway, but this needs more detailed surveying first.
  
  Feel free to reopen this if the explanation hasn't resolved the issue.