22 january 2021 - Utrecht, Vaartsche Rijn. 27 of these trams are used to operate service 22 between Utrecht Central Station and Utrecht Science Park (De Uithof). Currently they always operate in multiple and only on weekdays at a frequency of every 5 minutes.Utrecht, Vaartsche Rijn. 27 of these trams are used to operate service 22 between Utrecht Central Station and Utrecht Science Park (De Uithof). Currently they always operate in multiple and only on weekdays at a frequency of every 5 minutes. Author: ChrisGBNL