What must be done prior to coupling to passenger equipment?

Prior to coupling to passenger equipment, it is essential to make a stop just prior to coupling. This procedure is critical for ensuring safety and proper alignment of the equipment being coupled. Stopping allows for any adjustments or observations to be made safely before the actual coupling process begins. It helps prevent potential accidents or damage that could happen if the equipment were to be moving during the coupling maneuvers.

The other options, while important in different contexts, do not directly address the necessary action that must be taken immediately prior to coupling. Notifications of crew members and checking the brakes are standard safety precautions but they are part of broader operational protocols rather than the specific requirement immediately before coupling. Similarly, lubrication of the coupler is important for the proper function of the coupling device itself, but the immediate action of stopping to facilitate a safe coupling operation holds the highest priority.