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On Sept. 17, 2012, Chiheb Esseghaier and Raed Jaser drove to Jordan Station, a community in Niagara, Ont., wine country where the Maple Leaf train crosses a trestle bridge each day on its way from New York to Toronto.

Seven months later, the odd couple — one a Tunisian doctoral student, the other a school van driver and mover from Abu Dhabi — were arrested over what the RCMP has called an al-Qaeda-linked plot to derail a passenger train.

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Most details of the alleged terrorism conspiracy remain under a court-ordered publication ban that prevents the press from reporting what the men, who are both in their 30s, are accused of doing and saying, and why they may have wanted to kill Canadians.

But some documents related to the case have now been partly unsealed by an Ontario judge at the request of the National Post and other media outlets, and they show the arrests followed a massive police undercover operation that spanned several countries.