I want to go to badaling by S2 train early in the morning so that i can return to beijing by noon but i see the returning train from badaling to beijing doesn't start until 3:15 pm in the afternoon. So is it possible that i go to badaling by the S2 train and return back by taking the 919 bus to deshengmen? is this fast 919 bus station at badaling nearby the train station too? do i have to wait for long hrs for this bus or is it quite frequent? can i ask for help to the locals if i do not find the 919 bus station?