how do bullet trains couplings

A coupling (or a coupler) is a mechanism for connecting rolling stock in a train. The design of the coupler is standard, and is almost as important as the track gauge, since flexibility and convenience are maximised if all rolling stock can be coupled together.

There are two different kinds of couplers in the units: Automatic couplers on both unit ends (driver cab car), which permit the coupling with another unit, and semi-permanent couplers, which permit a permanent connection between cars forming a unit.

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