Division 7.2.9 Rolling stock with train protection Class A and Class B equipment

Rolling stock may be equipped with both Class A and Class B systems to enable operations on several lines. The Class B systems may be implemented

• using an STM that may be plugged into the ERTMS equipment (‘external STM’), or

• integrated within the ERTMS/ETCS equipment.

F1Also, the Class B system could be implemented independently (or, in case of upgrade or renewal, be left ‘ as is ’ ), in case of Class B systems for which an STM is not an economically viable alternative, from the rolling stock owner’s point of view. However, if a STM is not used, the Railway Undertaking must ensure that the absence of a ‘ handshake ’ (= handling, by ETCS, of transitions between Class A and Class B on track-side) nevertheless is properly managed.

When running on a line which is equipped with both Class A and Class B systems, the Class B systems may act as fallback arrangement for the Class A system if the train is equipped with both Class A and Class B systems. This cannot be a requirement for interoperability and is not valid for GSM-R.