On 12th of April 2022, a test drive of a four-unite diesel motor train, type L-4433-FLIRT3 DMU, ​​manufactured by Stadler, on the route Zagreb Central Station - Okučani in both directions, was performed. No effects on the correct operation of the signaling devices were recorded during the test drive. Accordingly, on 14th of April 2022, INFRACERT d.o.o. has issued a certificate of conformity no. 14-04/2022 with national rules of the four-unite diesel motor train, type L-4433-FLIRT3 DMU, unique codes of wagons: Motor wagon A (MA)-95 79 5 610 015-1, power wagon (Power Pack) (E)-95 79 5 610 016-9, passenger wagon (C)-95 79 5 615 015-6, motor wagon B (MB)-95 79 5 615 016-4.