By train, the ticket shows Tianjin to Changde. Does Tianjin mean Tianjin East Station?

Yes,

The ticket says Tianjin, which is Tianjin Railway Station.

Tianjin railway station, also known as Tianjin East Railway Station, is located on the north bank of Haihe River at the junction of Hebei District and Hedong District in Tianjin, China. It is a special station under the jurisdiction of China Railway Beijing Bureau Group Co., Ltd., a large-scale transportation hub integrating railways, subways, buses and taxis, and an important part of Tianjin Railway Hub.