I can't imagine a scenario where bus companies would have spare capacity sitting around on the eve of a long weekend. I can't imagine VIA being able to afford to pay them to hold capacity unused just to protect against a once-a-year contingency.
Not to mention, in many probable scenarios where the train is immobilised, getting passengers from train to ground to bus is likely not possible.
Having said that, I can certainly think that a bus company might reasonably have an obligation to cancel its charter for a junior football team, or a group going to attend a Blue Jays game, to make a bus available when a train is stranded The transcript pointed to maritime law where every ship has a duty to respond to distress calls. Some lesser version of this legal obligation might be desirable. Compensation to the cancelled party for that kind of priority might be affordable.
I wonder what logistics might be conceivable, however, to bring all necessary resources to a stranded train. Old timers have told me stories about how the auxiliary trains that were called out to major derailments were held in readiness, and if the roundhouse whistle sounded, the response was much like that of a volunteer fire department - all hands dropped what they were doing and suited up. It's not beyond belief that VIA might have to maintain the readiness to dispatch an ample supply of food and water from one of its operating bases. Perhaps also an emergency generator capable of powering one or two coaches, and an air compressor suitable to power one or two toilets, and a portable holding tank to drain same, is not beyond affordability and practicality. (A rescue locomotive may well meet these needs, if it were accompanied by a tool car with the right cabling and equipment....my imagination runs to a couple retired LRC cars might be available, just as old auxiliaries had retired heavyweight coaches as their staples - but more likely a highway or hirail "crash cart" type equipment would be realistic)
Hopefully a more effective protocol can be found as a contingency against future events. They will happen.
- Paul