@Jewbacchus there were still some localized wild train populations in America through the 1930s, but the proliferation of invasive species, notably the truck, caused a rapid destruction of the train habitat. So while I agree that domestication and inbreeding are problems, really it's the irresponsible introduction of the truck (and growing land usage dedicated to automobilicus americanensis, the common car) that led to us never getting to see a wild train in all its majesty.