The project includes the supply of 25 new low-floor articulated trams for 1 009 mm track gauge. In the framework of the supply of vehicles, the following items are included, which are mandatory elements to ensure normal operation of the trams and sustainability of the project: •Training of employees of “Stallen Electric Transport” EAD for management, maintenance, diagnosis and repair of trams. • Supply of diagnostic equipment; •Supply of specialised tools; •Provision of documentation for the trams.The project will be implemented on the territory of Sofia Municipality, and the purchased trams will be operated by “Stollen Electric Transport” EAD on existing tram lines 4, 5 and 18.