If I arrive at Huaihua South Train Station, how far is it to the bus station from there?

First of all, the coaches to Fenghuang County depart from West Bus Station. It is about 6 miles (10km) from South Railway Station. You can take a taxi to the bus station directly.
The buses are available from 6:40 to 17:40, and the fare is CNY 39 per person. The buses stop at Fenghuang General Passenger Transport Station, the new part of the town. The station is about 1.5 miles (2.5km) from the old town.