There are many brands with soup in Beijing South Railway Station, but based on personal experience, to avoid any pitfalls, I highly recommend Mr. Li’s Beef Noodle King. His beef noodle is super large, plentiful, and very affordable.
I personally think the taste is delicious. There are spicy, non-spicy, and colorful cold noodles. They are all very good. Since you want to eat them with soup, I highly recommend their spicy beef and bamboo shoot noodles.
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It's really great, the noodles are chewy, the beef is solid, and the price is not expensive. It's really nice.