During peak travel seasons, such as over Spring Festival or Chinese National Day, two shorter CRH trains may be coupled or linked to provide passengers with more seats available. These train compositions will double usual capacity — from 8 cars to 16 cars per train.
Only CRH train types CRH1B, CRH1E, CRH2B, CRH2E, CRH380AL, CRH380BL and CRH380CL trains are made up of 16 cars. In these trains, unless there is a physical barrier, passengers may move between all carriages without the need to leave the train. (Note: On some trains, the doors between Second Class and higher classes of travel might be locked.)
For all other CRH train types (in particular types CRH1A, CRH2A, CRH2C, CRH3C, CRH5A, CRH380A, CRH380B, and CRH380D), they may be coupled, so that two 8-car trains offer 16 cars using one train. (The new China Standard high speed trains are currently being developed in 8-car formation only.) However, it is important to note that there is no way to move between Cars 8 and 9 inside these trains, as there are no physical passageways inside the trains (in spite of the two being linked). Passengers switching between these particular carriages must exit the train and transfer on the platform.
There are at present no particular remarks on train tickets advising riders if they are travelling on such a coupled train — so if your train ticket assigns you seating from Cars 9 to 16, please be extra careful when boarding such a train. Ensure you use the designated ticket gates and board from the right carriage.