Thank you for the question.
First of all, I would say that the approach we take is very much dependent on the mode; for rail mode, we rely on advance commercial information. As well, with the rail lines that are trusted traders, the actual materials are considered to be in bond until they arrive in the country. We have insights into how they maintain the security of the conveyances.
Just to put it into perspective, between two and two and a half million rail cars come into the country every year. When I look at that risk level compared with the traveller regime or other sorts of modes, and given the data and the risk profile, rail is not something that we think is as big a risk as the union conveyed.
Quite frankly, when we do interventions, we don't actually stop at the border. The intervention would happen at the first point where we could do it safely. It very much depends on the goods being conveyed.
What we would like to do is to start working upstream where the rail cars are assembled in the United States, using the intelligence approach that we're focusing on right now, to make sure we're targeting the right train before it gets into the country.