Originally Posted by fransknorge

it seems that basically you got caught in Germany love of being precise: this was a reschedule. Your train is still in service but with a different itinerary due to work. It will deserves different station and takes longer. This is in effect a reschedule but for German minds : they cancel the original train service and replace it with one with the same number departing at the same time, so they inform you of the cancellation but not of the replacement. So you have nothing to do, just show up for the train you were scheduled for.