providing a voltage of 750 V DC. The contact wire has a cross-section of supported by several metallic utility poles positioned along the railway tracks. The rolling stock operated on the network is composed of 18 Citadis 302 low-floor trams built in its variation "Barcelona" (teal and white colors) by Alstom at its manufacturing plant in Santa Perpètua de Mogoda. Tram units are parked and maintained at the only depot of Trambesòs located next to Central Tèrmica del Besòs stop, on a triangular piece of land between the Ronda Litoral coastal beltway and the Barcelona–Mataró–Maçanet-Massanes railway. Autoritat del Transport Metropolità (ATM) is the transport authority responsible for fares and ticketing, and for marketing the network. Trambesòs is part of the integrated fare system within Barcelona metropolitan area and is entirely within ATM fare zone 1. Fares are the same as the ones applied on Trambaix as well as the ticket system. Single tickets can be purchased at stops by using ticket machines and allow you to transfer between other Trambesòs routes for 30 minutes without having to buy another ticket. All tickets or other transportation cards must be validated in a machine by the door of the tram although underground stops have ticket barriers so there is no need to validate the ticket on the tram. Stops The system currently comprises 27 stops, each following the same design and technical characteristics as Trambaix stops. Almost all stops have low platforms ( above rail level) with a ramp at each end of the platform. This allows wheelchairs, prams, pushchairs and the elderly to board the tram easily with no steps. The stops also have different platform layouts depending on the street section where they are located. Currently there are 8 stops with 1 island platform and 19 stops with 2 side platforms, three of which are located underground in the Gran Via section. There are also 8 stops that offer a transfer to Barcelona Metro network while only Estació de Sant Adrià stop offers a transfer to Rodalies de Catalunya commuter rail services, becoming the only stop of the whole network that offers a transfer to some kind of heavy rail services. Design and facilities of the stops are meant to provide universal access as one of the goals of the network since its planning. The stops follow a common design that has a discrete look to them, dominated by metallic