Obviously, Someone knew of the shipment and tracked it, or by chance some lucky houlums opened the boxcar of their dreams, by chance, hoping to find radios and TV's for Best Buy big box stores.
As the US does, they ship sensitive items, in a boxcar marked in 12" high bold letters: DODX. :hehe:
The US does not gaurd shipments at all, and railway police may be left to cover a 250 mile area, with only 2 tired overworked guys.