There was a station near Walgett called Colina or Colma or Colona or Colnia which was owned by a man called Dunne in 1900. I know this because my great-grandmother's first husband died there. Every copy I have ever seen of the name of the place is illegible.
Cannonbar was close to Nyngan, quite a long way from Mungindi. When the railway came to Nyngan, the pub and the post office and whatever else was at Cannonbar was shut down and moved to Nyngan.