According to the article, widgets of the type that exploded in this case are banned from trains in Pakistan.
Amtrak should be very concerned that they have eliminated serving meals in dining cars. Passengers may examine these things as options.
They even tried to use one on an air liner once on a flight originating in Pakistan. Same result. https://news.google.com/newspapers?id=RPJcAAAAIBAJ&sjid=5VkNAAAAIBAJ&pg=1583,3006837=en