Hi, Mr Eddy. No train from Tianjin airport to downtown Beijing. Beijing capital airport has express train to Dongzhimen, east part of downtown. If you arrive in DOngzhimen, you can take Subway Line 2 to Chongwenmen Subway Station, then just walk to the hotel. It wastes a lot of time to go to Beijing airport then to the railway Station. It costs about 20RMB from Bawangfen to the hotel. Other option: Take Tianjin airport but to Tianjin Railway Station (10RMB for about 45 minutes), or you can take a taxi (no more than 50RMB for 30 minutes). Tianjin Railway Station has inter-city bullet train to Beijing South Railway Station. It can reach Beijing 30 minutes later. Then take a taxi to the hotel. The taxi take the similar price and time as from Bawangqiao. Would like to tell more if you have other questions.