Barcelona will see summer disruption on Trambesòs lines T4, T5 and T6 from 3 July to 13 September 2026, as work on Gran Via enters a key phase. The changes are linked to the urbanisation project and tram track duplication between Badajoz and Bilbao streets.
The project is being carried out by the Metropolitan Transport Authority (ATM) and Barcelona City Council. It aims to replace the single tram track with a double-track platform shared with buses, as part of the wider tram connection project along Diagonal avenue and around Glòries square.
During this phase, the T4 line will be interrupted between Verdaguer and El Maresme. The T5 and T6 lines will be out of service between Ciutadella | Vila Olímpica and Sant Martí de Provençals. Based on 2025 validation data for the same period, the disruption is expected to affect between 2.6 million and 2.8 million journeys.
To reduce the impact, ATM and the city council have set up special bus services. One will cover the T4 route between Verdaguer and El Maresme, and another will run for T5 and T6 between Marina and Besòs. Metro line L4 will be the main alternative for several affected trips, while TMB bus line V21, lines H12 and 7, and Rodalies line R1 between Sant Adrià station and El Clot are also listed as alternatives. More local news
There will also be related changes to other routes and streets. The Llobregat-bound side of Diagonal avenue will be diverted at Tànger street, with access only for residents, services and the shopping centre up to Llacuna street. For cyclists, the bike lane on Diagonal between Ciutat de Granada and Glòries will be closed, with riders asked to use the Gran Via bike lane instead.
From 14 September, the T4 line is due to resume between Verdaguer and Estació de Sant Adrià, while T5 and T6 will run between Ciutadella | Vila Olímpica and Glòries. Work on Gran Via will continue after summer, with partial disruption for T5 and T6 between Glòries and Sant Martí de Provençals, before the affected section is reduced to Glòries and Can Jaumandreu by the end of September. The wider project is due to continue until spring 2027.