One problem with any long train is that nothing is designed to run it. There are no real long crossing loops (New ones 1.8km long to be built between Lithgow and Blayney.Between Crystal Brook and Goobang Jct., just about every second loop is 1800m+
Goobang Jct. (1870m).
And then between Goobang Jct. and Cootamundra West most Loops are 1800m+ also.
So, I am not really sure by what is meant that there aren't enough long loops?