it doesn't mean any particular outcome was inevitable. There were plenty of companies that resented the US making war on their former customers. Similarly there were many shipping companies that did want the cotton trade disrupted, or the Atlantic shipping traffic transferred to iron hulled British built ships. It does imply that if the federal government and the Republican party demonstrated it could win the war, the railroad companies, their employees and vendors, would throw in behind the US, and the war would end soon and in complete military victory. That is what happened beginning in September of 1863."A feature commonly found in general history books on the American Civil War is a set of statistics comparing the resources of North and South at the time of secession. Although such statistics may vary from source to source, they invariably show that the North enjoyed major advantages in terms of population, industrial capacity, wealth, and railroads. A careless reader might infer from these statistics that the Confederate States of America was doomed and the outcome of the Civil War decided before the first shot was fired. Even the more prudent reader might assume that these resource disparities were causal factors in the Confederacy's defeat. However, such assumptions overlook the fact that the war lasted four bloody years, and ultimately approximated the modern notion of "total" war. If the Confederacy's resource disadvantages were truly as debilitating as the statistics suggest, the war should have ended much earlier than it did."
I've attached the U.S. Army War College instructor's paper from which the quote came. A very interesting read to anyone interested.