Case C-388/17: Judgment of the Court (Ninth Chamber) of 28 February 2019 (request for a preliminary ruling from the Högsta förvaltningsdomstolen — Sweden) — Konkurrensverket v SJ AB (Reference for a preliminary ruling — Public procurement procedures in the transport sector — Directive 2004/17/EC — Scope — Article 5 — Activities relating to the provision or operation of networks to provide a service to the public in the field of transport by railways — Award, by a public national railway undertaking providing transport services, of cleaning service contracts for trains belonging to that undertaking — No prior publication)