reality, page-26

The following from the Reserve Bank is worth a quick look.
http://www.rba.gov.au/PublicationsAndResearch/Bulletin/bu_jun08/aus_exports_dev_asia.html#t6

In 2005, the Bank produced a survey of existing coal and iron ore supply chains, including estimates of the likely scale of rail and port expansions by 2007. While actual transport capacity for iron ore increased by 27 per cent relative to an anticipated rise of 15 per cent, the increase in coal transport capacity was below expectation, rising by 8 per cent compared with an expectation of 13 per cent.

One reason why supply chain expansions have been particularly difficult in the coal industry is that the fragmented ownership structure has complicated attempts to co-ordinate simultaneous investments, in contrast to the iron ore industry where the supply chains of large producers tend to be vertically integrated. (NOTE: Consistent with my point that consolidation/alliances are necessary if juniors are to get their share of the iron ore market).

….iron ore transport capacity is anticipated to rise by a further 36 per cent between 2007 and 2009. (see Table A1).