The requirement for approval of railway rolling stock by the Railway Authority (DÚ) for the possibility of their operation on the railway lines of Czech Republic is stipulated by Act No. 266/1994 Coll., as amended, and by the actual legislation of EU (Commission implementing regulation EU 2018/545 of 4 April 2018 which determines the practical rules for approval process of railway vehicles and their types and related documents). The relevant approval process appears always from the requirements stated in the quoted Commission implementing regulation.
The necessary information for the approval process of railway vehicles and types are clearly stated on the particular pages of the One Stop Shop form which is managed by ERA (general reference under https://www.era.europa.eu/).
A part of the required groundwork is also a positive documentation evaluation of the railway vehicle and its properties, given by results of tests and further verifications carried out. This evaluation is ensured by authorized subject.
VÚKV a.s. is the legal entity authorised by the Ministry of Transport of Czech Republic for testing and overall assessment of rolling stock subsequently used as the basis for the administrative action. VÚKV a.s. is also an associated partner of several notified bodies and/or designated subjects whose power also covers Czech Republic.