Loads southbound are restricted by a section of track known as the pearlah Bank 
(btn Wannila and Coomunga)
Max Load over this section  is
running south       running North
830 - 750t											725t
NJ - 675t												650
NT - 700t												700
With multiples up to three.
The biggest southbound train known was 4/830 for 3000t run 15-1-90
A singl NT has hauled twn NT load up Pearlah without any problems (trailing unit 
had shut down without crew knowing!)
Heaviest trailing load permissible for any section is;
nj -1350t
830 1150t
NT 1300   
North bound Warramboo to Kyancutta
Regards
Nic