In order to demonstrate that a generic relay circuitry for the interface between two electronic interlocking systems works properly in the events of notifying the profile clearance, transiting the warning signal and the logical agreement between two interlocking systems, a safety case according to Mü 8004 is created.

In addition, an assessment of the generic relay circuitry is carried out by using the cases of profile clearance and Ks distant signal. The aim of the assessment is a type approval or an approval according to VV NTZ.