What kind of hook can't the close coupled hook be directly connected to?

The close coupled hitch consists of three parts: the coupling system, the cushioning system, and the mounting and hanging system, and is characterized by its small size and light weight. The ordinary hitch does not have a mounting and hanging system, and the structure of the cushioning system is different from that of the close coupled hitch, so it can't be directly connected to the close coupled hitch.

In shunting operations and special circumstances, when the crew is required to be connected with the rolling stock equipped with ordinary hooks, special center-conversion hooks can be used for connection. The model of the intermediate conversion hook is determined according to the model of the hook connecting the two cars, for example: if the two hooks connected to the two cars are E-type and C-type, then the intermediate conversion hooks are E-type and C-type hooks.