In August 2013 the signal box at Mainz main station could not be fully staffed. Of its 15 employees, five were sick and three on holiday, according to Bild am Sonntag. For about two weeks, trains had to be rerouted or were canceled. A labor lawyer explained to the legal portal LTO: Eine rechtliche Verpflichtung der Mitarbeiter, vorzeitig aus dem Urlaub zurückzukommen, gibt es aber nicht. There is no legal duty for employees to return early from holiday. Deutsche Bahn’s chief executive, Rüdiger Grube, apologized in public. A railway spokesman said: Zusätzliche personelle Kapazitäten gibt es nicht. There are no additional staff.