The Facts about Chinamax - MFC...."Lastly despite the common carrier of QNS&L, Bob Martin ex-IOC, ex-NML stated rail had capacity of 43 m tonnes without additional capex. IOC =26, Wabush =6; LIM = 4; Tata=4; Bloom = 16 Total = 56, okay assume Wabush is just 2 and Cliffs = 14, LIM scraps by at 2 and Tata at 4; Total is now 48, so the CN Rail project is starting to look like a requirement......
FWIW, there is a study by Stassinnu Stantec LP on NL Govt website. Says that with additional investment of about $0.4- $0.5 billion investment QSN&L can move 88 million net tonnes per year.
Also briefly discusses topography problems around port of SI wrt suitable land for railyards, laydown areas, etc.
Go to this link https://www.nr.gov.nl.ca/nr/mines/Julienne/index.html
and scroll down 'till you see :
Infrastructure Study