If you have a look at the Epping to Thornleigh 3rd track , a distance of 6.56 KM of new track
which is costing $592 million , thats $90 million per km.
Is this the most expensive rail line ever laid in Australia?
To put this in perspective , the cost on a per km basis of building the Channel Tunnel was $40 million per km.
The Gotthard Tunnel under the Swiss Alps is only costing $80 million per km.
Where on earth is all the money going?
Getting that third track in is not going to be easy and that is why it is expensive. At the Epping end that brand new sub-station has to go and be re-located and just look at Pennant Hills, that is going to be a logistics nightmare. Does the cost include fitting out Cheltenham as an easy access station with lifts etc? But for the expense of electrification it would have been cheaper to tunnel a new route (as shown on the plans), but electrifying all the way to Brisbane is just not on.