RE: My Bet is on the Railroad Tarquin4. The ROF & NW Ontario are not Afghanistan where for Iron ore "the best alternative per reseachers would be a 2,260 mile (3,767 km) rail network linked to Pakistan that for the Afghan part would cost US $45 billion".
By comparison, the ROF NS RR is a cake walk and the Chromite Ores + other Ores compared to Afghan Iron ore able to easily afford whatever the ROF NS RR costs.