>Snip
  >Are there any others?  Any similar "railways" in 
  other states?
   
  The "west" curve between the Bankstown and Metropolitan 
  Goods (Enfield-Flemington) lines in Sydney. The embankment was built, though I 
  think now it's largely disappeared. I have even seen it shown as a completed 
  railway in some street directories.
  (To forestall the attacks - I take "SUBSTANTIAL" in 
  your original posting to mean that a substantial portion of the work necessary 
  to construct a working railway was completed. I would argue that building 
  the embankment represents a pretty substantial proprtion of the 
  construction, even though, in this case, it would not have been a 
  substantial part of the railway network in terms of distance.) 
   
  Rgds
   
  Ron BESDANSKY