There is one at Tiejiapo Station, just beside the road. Just watch (Wuchang-gedian), and it runs every few minutes on average. (Wuchang-Huarong) It's ok, and it costs 8 yuan to pass gedian.
If you want to save money, you can take No.25 (5 yuan), but the terminal of No.25 is 500 meters away from gedian Station. Decide what to take.