The Winnipeg Free Press has an article about the stranded VIA passengers. There are some interesting details about the number of passengers carried. VIA 1 (stuck in Winnipeg) had 85 passengers, while VIA 2 (stuck in Melville SK) had 41 passengers. The article states that the westbound Canadian was scheduled to leave at 10 PM last night.
The CBC has an article as well, with some great photos of the derailment. Apparently the westbound train had 99 cars, all potash, and 56 of those derailed in a spectacular fashion in Daly MB. Fortunately noone was injured and there are no dangerous goods involved.