I think it's rude for people to express thier dislike or hate for certain animals, or anything else, when that has nothing to do with the question posed. All responses should have been to the adviseabiliity of whether a pet, no matter what kind of pet, should be snuck onto the train since.there is a no pet policy.
I think you misunderstood me. I hate the act people "sneaking" rats onto a train, not the rat itself. So basically, I do not think the OP should even try to do it, because I do not like "sneaky" business. I was not expressing my hate for rats, and I think my answer does relate to the question, because I wanted the OP to know that he should not attempt "sneaky" business, which is exactly what he was asking about.