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rolling stock shall be aerodynamically designed so that for a given combination (reference case) of train speed and tunnel cross section in case of a solo run in a simple, non-inclined tube-like tunnel (without any shafts etc.) a requirement for the characteristic pressure variation shall be met.
Železniški vozni park mora biti take aerodinamične konstrukcije, da je za dano kombinacijo (referenčni primer) hitrosti vlaka in prečnega prereza predora med samostojno vožnjo v preprostem, nenagnjenem cevastem predoru (brez jaškov ipd.) izpolnjena ustrezna zahteva glede značilnega nihanja tlaka.