As an exception to the provisions of 2° of Article R. 15-19 and 3° of Article R. 15-20, officers and agents of the judicial police belonging to the zonal or departmental border police directorates or to the territorial border police services of the territorial directorates of the national police are competent to operate on the entire railway domain within the jurisdiction of the zonal directorate to which they belong and the bordering zonal directorates.