Stranded, grumpy hungry passengers is so not a federal emergency response issue. Unless it degrades to the point that public safety is a concern, it's not even a primary provincial or local emergency services issue. It is a too-easy trap to upload to the federal government (the provinces and municipalities to it all the time, and the feds muddy the waters further by dipping their toes in non-federal issues). I know of no federal agency that is equipped or mandated to recover passengers from a land-based public conveyance. The CAF, through the Joint Rescue Coordination Centers, is primarily responsible for maritime and aviation incidents. They will assist in land-based incidents at the request of a province. Having said all of that, do we expect them to hoist passengers out by helicopter? Other military assets could be made available as an 'aid of the civil power' provided a request flows from the Premier (or possibly Sol-Gen) to Chief of Defence Staff. By the time that gets sorted out, the passengers could probably walk out. Even at that, what assets could the military bring to the table. If it is near a base, they might have some buses, trucks and vans.
Emergency response, if in fact these are true 'emergencies', is primarily a local responsibility. Emergency services in larger municipalities will often have agreements with other municipal departments, such as transit. As Paul mentions, there might be issues with those assets operating outside of the municipality; I don't know. Outside of larger municipalities, local services might be thin.
If the government saw fit to amend legislation to make events such as these a federal responsibility, money would have to flow. In my humble opinion, domestic non-natural disaster response is not a military matter. Even with more money, the CDS has already said that the assistance they have been providing to fires, floods, etc. are coming at the cost of training and readiness.
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