Between 26 September and 20 October 2006 Thalys PBKA 4302 was used for test runs on the HSL 4/HSL-Zuid. These test runs started at Antwerpen-Luchtbal station and ended or at the border, or at the viaduct over the "Hollandsch Diep", depending on the clearance of the Dutch tracks by the Dutch authorities.

Detail on the destination indicator, which displays "Thalys Special - Restricted Access". Also the train number is indicated: the next test run will run under the number 18155.