Division 7.2.2.2 Lines to be upgraded (re-signalled)

When control-command and signalling is upgraded, a line shall be equipped with the class A functions and interfaces according to the specifications given in Annex A. The control-command infrastructure shall provide the class A control-command interfaces for the trains in the same way as for lines to be constructed.

The upgrade may concern separately the GSM-R radio part, the ETCS part and the train detection part of the control-command subsystem.

After the upgrade the existing class B equipment may remain in use simultaneously with class A according to point 7.2.1.2.

Class B control-command equipment trackside EMC limits may remain in use until the control-command subsystem is upgraded.

The time interval in which a certain line is equipped with both class A and class B control-command equipment is a trackside transition phase. During this transition phase, it is allowed to use existing class B equipment on-board as a fallback arrangement to class A system: this does not allow an infrastructure manager to require class B systems on-board the interoperable trains for running on such a line.