art_4__para_2__text_1
However, the requirement to hold a certificate for a specific part of infrastructure shall not apply in the exceptional cases listed hereafter, provided that another train driver who possesses a valid certificate for the infrastructure concerned sits next to the driver during driving:
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Source: EUR-Lex (Cellar) · retrieved 2026-10-29 · Text as adopted (Official Journal); later amendments are not incorporated in this text.