Roadmans comments on uhub are an interesting topic. The (T) first issued an alert citing "track issues", then updated it to "disabled train", he takes issue with the alert system chronically not reporting what's actually going on.
Both alerts underscore the severity of a train going into the wall of the tunnel. If I get an alert for track problems or a disabled train, it implies that by the time I take the bus to the red line to the green line, chances are pretty good the issue will be resolved before I get to it.
If they said there was a derailment, as they should have (since that's what happened), it would properly imply that the C and D are fucked, and I would stay away. Why is there an alerts system if they sugarcoat what's actually going on? It removes its core function: to inform riders of potential issues so they can avoid them instead of making them worse.