The Question and Answer section for Atlas Shrugged is a great resource to ask questions, find answers, and discuss the novel.
I imagine cause a rise in seal level, which leads to massive flooding. This, however, is a literary site so I would not take my answer as correct.
Does this question relate to Atlas Shrugged? If not, it cannot be answered on this forum. This is a short-answer literature forum.
The railway line is deteriorating, it is in a state of decay and desperately needs to be rebuilt.