There is only one bus from Nanjing to Yancheng every day. There are no express trains and bullet trains at present. Please see:

The 5076 Nanjing departure 12: 13 arrived in Yancheng 16: 13 322 km. Take the express train for 4 hours and 0 minutes. The fare is 25 (hard seat) Nanjing-Yancheng.

There are many buses from Nanjing to Yancheng (the starting stations include Central Gate, Zhonghua Gate and Hanzhong Gate), and the fare is 70-93 yuan (different models).