Bob Dylan’s fantastic new album opens with a train song. Given the wrath to come and the often elemental ire that accompanies it, not to mention all the bloodshed, madness, death, chaos and assorted disasters that will shortly be forthcoming, you may be surprised that what’s clattering along the tracks here isn’t the ominous engine of a slow train coming, a locomotive of doom and retribution, souls wailing in a caboose crowded with the forlorn damned and other people like them.