Don't try to contact a member of staff at the German car giant Volkswagen this Christmas. VW's email server will shut down outside working hours. - 

Workers at Volkswagen's Tennessee factory are expected to hear this week about a bid to give them a greater voice with management.  The move would give a small foothold to unions at a typically non-unionized car plant.

The BBC's Steve Evans in Berlin joins Marketplace host David Brancaccio to discuss. 

Click the audio player above to hear more.