 Their introduction in Bucharest required a specially-built depot for them along with a new team of well-trained technicians to fix these trams.They have almost always been allocated to the Militari depot, apart from a short time when they were temporarily transferred to the Dudești depot in order to allow the facility at Militari to be renovated.In 1998, RATB began a project of modernisation of the T4R cars by making an articulated six-axled car from two T4R cars.