und noch an anderer Stelle:
(c) For T, CT, GT, GTS and GTP cars of period F up to and
including period G2 [specificities and/or exceptions: see Article
5.13.2 (b)], a ROPS conforming to Appendix VI, A to which
must be added one diagonal bar between an intersection and
a mounting point, on the main hoop or between the rear struts,
as well as a maximum of two anti-intrusion bars on each side as
specified in Article 5.13.6 (b). Reinforcements made according to
the Drawings K-13 to K-37 of Appendix V are also allowed. The
minimum specification is a ROPS in conformity with Article 5.13.5
(f).
Das heißt, Flankenschutz und Diagonale müssen sein.