It sounds like transfer flight from A to B to C. At present, it can be done in most cities. I think the Tianjin Railway Station probably provide such a service. You will be asked to pay surcharge CNY5 for each ticket. The trains from Tianjin railway station stop at Shenyang or Shenyang North railway stations. These two stations both are located in the downtown and not far from each other. So, don't worry about accomodation. You can find a clean and safe hotel just near the railway station. You shouldn't pack very valuable things in the luggage box. In the hard sleeper compartment, you can put the large luggage without valuables on the luggae shelf and take along the valuables on your body. Dont' worry. China has good pulic security. But during the travel, you must keep your cash, mobile phone and other valuable things safe. Be careful with the pickpockets.