So it is possible that EC 54 will be running, but to different time table, or from a different station (has been done before), or will be substituted by a bus.
I see that the timetable now has information on the disruption. But when you try to book a ticket you stille get:

Please SBB: Try to make this message more useful. For example, tell potential customers here about the disruption, and that they should come back later when the schedule is final…