This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
ERTMS level b.svg en Mixed train traffic using the European Rail Traffic Management System ERTMS with trains in ERTMS level and in level nl Gemengd treinverkeer binnen het European Rail Traffic Management System ERTMS met treinen die rijden in ERTMSniveau en own Marten de Vries other versions cczero Uploaded with Railway signalling