What's the difference between the fare from Huai 'an Station to Nanjing and 58 yuan, 40 yuan?
All the same. There are two trains in 40 yuan every day: one at 7: 15 in the morning and the other at15 in the afternoon, with 33 seats. But there are many buses with 33 seats in 58 yuan, and only some buses have more than 40 seats! If you want 40 yuan to take the bus, buy tickets for those two classes.