Best Method To Detect a Rail Car Being Delivered?

I have a client that would like to be notified by email when rail cars (pulled by a train) are dropped off at their plant (grain elevator).

The railcars are delivered at random and the Plant Manager would like to be notified so he can call his staff into work.

What do you recommend? Camera setup with Motion detection or video analytic? Motion sensor? Other?

They currently have an Avigilon NVR and two Avigilon 3MP IR bullet cameras mounted on the exterior of the elevator. My thought was to add another camera directly facing the railcars.

The goal is to have the fewest number of false alarms.

railcarandelevator
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