The Passage through locks is regulated in § 6.29 in the Police Regulations for the Naviagtion on the Moselle.
From January 1st 2012 on this right is only applicable between 7 AM to 8 PM.
The Federal Waterways and Shipping Administrations Koblenz and Trier have therefore published a brochure containing all information for the users of the watrerway in German, French, English and Dutch.
The English version can be downloades here.
The other versions cand be found on the ELWIS-Website.