Hi MN
Greeting from Peggy, Top China Travel.
If you plan to have a 2-week trip, the time is enough to visit 5-6 cities generally.
And train from Tianjin to other places is not as convinient as that ones in Beijing, if you plan to visit other cities by train from Tianjin, the most comfortable and convinient way is take a train to Beijing firstly and then transmit the train to the other one. You can just transmit the train in the train station. And the C train from Tianjin to Beijing only costs 33min transportation.
And for the nearby cities which you can visit, the following can be recommended to you:
Xian - train from Beijing to Xian is about 5.5hrs, you can visit Terracotta Warriors and experience the ancient Chinese culture there. Generally, a Xian tour will be a 3-day tour.
Taiyuan, Datong, Pingyao -train from Beijing to Taiyuan is about 3.5hrs, you can visit Jinci Temple, Datong Yungang Grottoes, Pingyao Ancient Town. Generally, a Taiyuan-Datong-Pingyao tour will be a 6-day tour.
Luoyang, Shaolin Temple - train from Beijing to Luoyang is about 4hrs, you can visit Longmen Grottoes and Shaolin Temple. Generally, a Luoyang-Shaolin Temple tour will be a 4-day tour.
So which places do you prefer? You can check about some tours on our site firstly:
Beijing-Xian-Luoyang tour
Beijing-Xian-Datong-Pingyao tour
Or if you have any other place plan to visit, you can let me know firstly
Feel free to contact with us in any moment by mail if you have any question on China tour service.
Have a nice day!
Best Regards
Peggy