I bought the bus from Beijing West to Hengyang Railway Station, can I get on the bus at Gaobeidian?

Only K21 and K599 trains from Beijing West to Hengyang stop at Gaobeidian. As long as you buy tickets for these two trains, you can get on the train at Gaobeidian.

If the train stops at Gaobeidian, you can get on the train at Gaobeidian station. If it doesn’t stop, you won’t be able to get on the train. Among the ordinary trains from Beijing West to Hengyang Railway Station, only the two trains K599 and K21 stop at Gaobeidian, and the rest of the trains do not stop. If your ticket is one of K599 or K21, you can get on the bus at Gaobeidian Station.