Coupling Hook - TeamOpenIndustry/ImmersiveRailroading GitHub Wiki
Overview
This item is used check the coupling status of stock and set the coupling mode. It is crafted as follows:

Usage
Right clicking on a piece of rolling stock near a coupler will tell you where it is coupled to and the current coupling mode.

Shift + right clicking on a piece of rolling stock near a coupler will set the coupler mode.
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Shunting mode means that the cars can bump into each other, but they won't couple. 
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Normal mode means that when cars bump into each other they will couple and form a train.