Definicija: pomeni nacionalni organ, ki je zadolžen za naloge v zvezi z varnostjo na železnici v skladu s to direktivo ali kateri koli organ, ki mu je več držav članic zaupalo te naloge, da bi zagotovil enoten varnostni režim

Definicija: The National Security Agency/Central Security Service (NSA/CSS) leads the U.S. Government in cryptology that encompasses both signals intelligence (SIGINT) and information assurance (now referred to as cybersecurity) products and services, and enables computer network operations (CNO) in order to gain a decision advantage for the Nation and our allies under all circumstances.