I think it's not fair to fault DB or EVG for failing to run 100% service after a nationwide strike was called off just a few hours before it was supposed to start. An orderly temporary shutdown of a major rail network is going to require plenty of ramp-down and ramp-up as trains and people get in position. Some of that was undoubtedly already underway when the tentative agreement was reached, and you can't just turn it around on a dime.