> Railways, as well as telecommunications companies, ISPs, public airlines, bus lines, taxicab companies, phone companies, cruise ships, motor carriers, freight

> Railways, as well as telecommunications companies, ISPs, public airlines, bus lines, taxicab companies, phone companies, cruise ships, motor carriers, freight companies, and others CANNOT discriminate. Funnily enough, several of the things you have listed (I believe, actually, most of them) are not common carriers but contract carriers. That means they can discriminate, except against the enumerated prohibited classes.