Via Rail says recent train cancellations along its Toronto-Ottawa-Montreal corridor were in response to "heightened operational pressure." A number of trains between Toronto and Ottawa, Ottawa and Montreal, and Montreal and Ottawa were cancelled "end-to-end" Monday due to what Via Rail's live tracker called "operational constraints." Pressed for details, the federal Crown corporation declined to be interviewed but said via email that the cancellations are a short-term measure meant to "protect service reliability" during what's expected to be a challenging time.