An empty platform is seen at the main Berlin train station during a nationwide strike called by the German trade union Verdi over a wage dispute, in Berlin, Germany, March 27, 2023. REUTERS/Annegret Hilse

Protestors demonstrate in front of 'Landungsbruecken' at the harbour during a nationwide strike called by the German trade union Verdi over a wage dispute in Hamburg, Germany, March 27, 2023. REUTERS/Fabian Bimmer

An electronic display reading 'no traffic of trains due to the strike' is seen at the main railway station during a nationwide strike called by the German trade union Verdi over a wage dispute in Hamburg, Germany, March 27, 2023. REUTERS/Fabian Bimmer

A guard closes the gate of a storage facility for buses during a nationwide strike called by the German trade union Verdi over a wage dispute, in Bonn, Germany, March 27, 2023. REUTERS/Wolfgang Rattay

A man walks past planes parked at Frankfurt airport during a nationwide strike called by the German trade union Verdi over a wage dispute, in Frankfurt, Germany March 27, 2023. REUTERS/Kai Pfaffenbach

ICE high-speed trains are parked in a depot of German railway company Deutsche Bahn during a nationwide strike called by the German trade union Verdi over a wage dispute in Hamburg, Germany, March 27, 2023. REUTERS/Fabian Bimmer

People stand inside the Frankfurt airport during a nationwide strike called by the German trade union Verdi over a wage dispute, in Frankfurt, Germany March 27, 2023. REUTERS/Kai Pfaffenbach

Buses are seen at a storage facility during a nationwide strike called by the German trade union Verdi over a wage dispute, in Bonn, Germany, March 27, 2023. REUTERS/Wolfgang Rattay

A view shows the empty platforms of Munich's main train station during a nationwide strike called by the German trade union Verdi over a wage dispute in Munich, Germany, March 27, 2023. REUTERS/Lukas Barth

A stranded tourist from Prague stands at the empty Cologne Central Station during a nationwide strike called by the German trade union Verdi over a wage dispute in Cologne, Germany, March 27, 2023. REUTERS/Jana Rodenbusch

Workers protest at Munich's main train station during a nationwide strike called by the German trade union Verdi over a wage dispute in Munich, Germany, March 27, 2023. REUTERS/Lukas Barth

A general view inside the Munich Airport during a strike called by the German trade union Verdi over a wage dispute, in Munich, Germany, March 26, 2023. REUTERS/Lukas Barth

A general view of the empty Cologne Central Station during a nationwide strike called by the German trade union Verdi over a wage dispute in Cologne, Germany, March 27, 2023. REUTERS/Jana Rodenbusch

A person sits at the platform of Munich's main train station during a nationwide strike called by the German trade union Verdi over a wage dispute in Munich, Germany, March 27, 2023. REUTERS/Lukas Barth

A view shows an empty tram station during a nationwide strike called by the German trade union Verdi over a wage dispute in Munich, Germany, March 27, 2023. REUTERS/Lukas Barth

A display board shows the list of cancelled flights at Frankfurt airport during a nationwide strike called by the German trade union Verdi over a wage dispute in Frankfurt, Germany, March 27, 2023. REUTERS/Kai Pfaffenbach

A view of a departures board inside the Munich Airport during a strike called by the German trade union Verdi over a wage dispute, in Munich, Germany, March 26, 2023. REUTERS/Lukas Barth

A view of empty tracks at the main train station during a nationwide strike called by the German trade union Verdi over a wage dispute in Berlin, Germany, March 27, 2023. REUTERS/Annegret Hilse

Trams are seen at a storage facility during a nationwide strike called by the German trade union Verdi over a wage dispute, in Bonn, Germany, March 27, 2023. REUTERS/Jana Rodenbusch

A person sits at the platform of Munich's main train station during a nationwide strike called by the German trade union Verdi over a wage dispute in Munich, Germany, March 27, 2023. REUTERS/Lukas Barth