A method for operating a zugintegritätssicherungssystems, which is a zugschlussgerät (16) comprises,(a) wherein the zugschlussgerät (16) a lock (34) for fastening the zugschlussgeräts (16) on a carriage (14) of a train (10) and(b) a communications device (24, 26) for transmitting and receiving characterization codes, and(c) wherein the zugintegritätssicherungssystem a key (36) for actuating the lock (34) comprises,with the step ofExchanging of the characterizing code between the zugschlussgerät (16) and the key (36) in the case of the actuation of the lock (34) with the key (36), characterized in that the steps of– Determine whether the zugschlussgerät (16) on a carriage (14) of the train (10) is fastened,– if yes, determine whether the characterizing code for opening of the lock (34) authorized and– Release of the lock (34) exclusively in the case of authorization, be carried out.
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