Coupler
In railway engineering terms, a coupler is a device made to join railway vehicles in a train. A railroad coupler allows a locomotive to be connected to a following railcar.
Basically, a coupler makes it possible to connect one car to another via the rails. No matter the speed of the locomotive, no matter if there are curves, even if the car is heavy or light. This way the cars will be connected no matter what the circumstances.
This in its years was a great innovation on the part of railroad engineers.
If only there was a human relationships engineer.












