ERTMS = ETCS + GSMR

ETCS is the new control-command system
GSM-R is the new radio system for voice and data communication

Together, they form ERTMS, the new signaling and management system for Europe, enabling interoperability throughout the European Rail Network.

For more information on GSM-R, please visit:
http://gsm-r.uic.asso.fr/
http://www.gsm-rail.com/index_i_e.html