Through train is the first operation mode in China in which a single driver takes a value ride and a long-distance train changes midway. Traction locomotives are usually HXD 1D electric locomotives (Harmony Electric 1D electric locomotives).

HXD3D electric locomotive (Harmony 3D electric locomotive) Dongfeng 1 1G diesel locomotive, Shaoshan 9 electric locomotive, Shaoshan 7E electric locomotive and Shaoshan 8 electric locomotive (for special use when entering Hong Kong). The cross-bureau train number of the direct express train is Z 1-Z4998, and the in-pipe train number is Z500 1-Z9998. The standard pronunciation of the railway system is "straight times", and ordinary people are used to reading "z times".

The development of history

On April, 2004 18, after the fifth speed increase, there was an express passenger train for the first time, and the number of trains was zigzag.

In the past, although there were Beijing-Shanghai express trains on the railway, the trains were mixed in the express trains and stopped at three stations (later changed to two of them) that needed technical operation.

After the map adjustment on June 14+February 10, all the express trains using 25T passenger cars in China Railway were upgraded to through express trains, but many of these trains still passed through the stops during their operation, so the definition of through express trains evolved into "ordinary passenger trains with the highest running speed160km" after the map adjustment.