Yes. You'd leave from Beijing via BeiJing Xi Train Station. You'll arrive in Shijiazhuang about 3-5 hours later, and be right downtown. The NanSanTiao market isn't far from there. The train station in Shijiazhuang is right on the main downtown street "Zhong Shan Lu" 中山路。 Since it's a "lu" it runs east-west. Go to the west about two-three blocks and NanSanTiao market will be to your left. The best way, though, would just be to hop in a cab and tell the driver where you want to go. The walk isn't far, and the busses are easy to get the hang of, but if you're not familiar with the city, or the market, you might get lost easily. Shijiazhuang isn't as "foriegner friendly" as Beijing is, in the sense of having a lot of things in English or Pinyin to help you find your way around. You're not likely to meet many English speaking people. However they are more foreigner friendly, in thier attitude. So, depending on your language skill level with Chinese, you may or may not find it difficult to navigate. I have some ex-pat friends in that city (from various countries of origin). You could call them up once you're on your way into town, and meet up with them. They'll show you around, help with the language barrier, and probably take you out for a night on the town (some good bars and dance clubs there too, just don't get on the stage and then moon the audience, that'll land you in jail hurting (don't ask how I know that)).
Let me know when you get closer to actually going there, and I'll send you names and phone numbers of some folks in town who can help you out. My email: snipped-for-privacy@yahoo.com.
-Troy Howard (aka Da Tong (or, in Shijiazhuang, WuJunHua))