Two things, or maybe three.
1. IBM’s Semaphore system was all border forces ever wanted. Th rest was a catalogue of pliable requirements, largely misunderstood and certainly not verified by the customer.
2. In North America, freight trains cross the 49th parallel border many times during thei progress across the continent. Each freight car has its contents and their customs properties logged against a transponder identifying the car. Just before the train crosses the border, the transponder is read and a bill of lading produced for the receiving bond master so he can quickly work out his bill of work. I cannot for the life of me understand why we should have difficulty in designing, developing and implementing such a system between us and our erstwhile friends on the continent. Please help me out.