For example, the coupler bumper beam coupler forms a vehicle connection mechanism!
When the car is running, the coupler is locked, which can swing left and right and move up and down appropriately.
When accelerating, the locomotive coupler transfers the pulling force to the vehicle buffer device through the coupler. And transmitted to the light beam.
Don't think like this when you slow down. Every locomotive and vehicle has an air brake.
Use pressurization to relieve decompression braking and slow down at the same time, so the coupler is not stressed!
There are people who don't know how to get to the railway!