A passenger plays with his grandson on the train from Jilin to Tumen in Northeast China's Jilin province. [Photo by Qu Xiaoxi for chinadaily.com.cn]

To keep warm, the windows of the train are all equipped with windproof crystal board. Temperatures in the coach can reach 20 C even during the coldest periods.

The train passes through several settlements of the Korean ethnic group, so all notices and slogans have been written in both Chinese and Korean.

"The slow and inexpensive train will be reserved for the convenience of passengers," said an officer of the Jilin Passenger Transport Section. "Furthermore, we will pay more attention to improve service quality."