"1.2.1.1.2.3" . . _:vb10277 . "Optional GSM-R functions"@en . . _:vb10277 . "Use of optional GSM-R functions which might improve operation on the line. They are for information only and not for network access criteria."@en . _:vb10377 . "1.1.1.3.3.3" . "CRG_OptionalFunctions" . "2021-08-08"^^ . "2021-09-12"^^ . _:vb10555 . "stable" . _:vb10377 _:vb10555 . _:vb10277 _:vb10377 . . . _:vb10555 .