Case C-453/20: Judgment of the Court (Grand Chamber) of 3 May 2022 (request for a preliminary ruling from the Úřad pro přístup k dopravní infrastruktuře — Czech Republic) — CityRail a.s. v Správa železnic, státní organizace (Reference for a preliminary ruling — Article 267 TFUE — Concept of ‘court or tribunal’ — Criteria relating to the constitution and function of that body — Exercise of judicial or administrative functions — Directive 2012/34/EU — Articles 55 and 56 — Single national regulatory body for the railway sector — Independent regulatory authority for the sector — Entitlement to act on an ex officio basis — Power to impose penalties — Decisions that are open to challenge before the courts — Inadmissibility of the request for a preliminary ruling)