Which subway does Beijing Sanlitun take to Beijing railway station?
The most convenient bus is from Sanlitun to Beijing station. Take 673 at the workers' Stadium and get to the east of Beijing station. It's about 50 minutes
You need to do 117 in Xingfu third village by subway, take line 2 to Dongzhimen, get off at Beijing station, exit a, the time is almost the same as the bus, but you need to change to walk more than the bus.