Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field unknown
Is Reference of Señal en plena vía-es#Sense
Σήμα ανοικτής γραμμής-el#Sense
Segnale in linea-it#Sense
Streckensignal-de#Sense
Signal on open line-en#Sense
Signal de pleine voie-fr#Sense
Sein op de vrije baan-nl#Sense
Sinal de plena via-pt#Sense
Signal på fri bane-da#Sense