Hi, i'l be arriving Beijing at 00.05 a.m , will take airport shuttle line 2 to xidan estimated arrival in xidan is 02:35 FROM THERE WILL TAKE SUBWAY LINE 4 WHICH OPERATES AT 05:00 is the subway station open , and is there a waiting area and most important is it safe?from this subway line 4, how many minutes will it take to arrive at South Railway Station?coz need to catch the first train to tian jin