A wiring fire in a critical city-centre tunnel caused chaos across Barcelona’s commuter rail network during Tuesday’s evening rush hour, forcing the suspension and diversion of several major Rodalies de Catalunya lines and leaving thousands of passengers stranded.

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The incident occurred in the subterranean passage connecting two of the city’s busiest transport hubs, Plaça de Catalunya and Barcelona Sants station. Detected at approximately 6:30 PM, the fire damaged essential signalling cables. This compelled Adif, the rail infrastructure administrator, to immediately halt all traffic through the vital artery.

While firefighters extinguished the blaze before 7:30 PM, the damage to the infrastructure prompted significant and ongoing service alterations. The incident underscores the fragility of the city’s transport network, which has recently been plagued by service interruptions stemming from both widespread vandalism and severe weather events, like the storm damage that disrupted Badalona’s R1 service.

Service Alterations and Passenger Chaos

The closure of the Plaça Catalunya tunnel had an immediate knock-on effect on the R1, RG1, and R4 lines, which all use this route. In response, the national train operator, Renfe, rerouted services through Barcelona’s other main underground throughfare, the tunnel via Passeig de Gràcia station.

The specific alterations are as follows:

  • R4 Line: Renfe diverted trains travelling from the north at Montcada Bifurcació. Instead of their usual route, they are making stops at Sant Andreu, El Clot, and Passeig de Gràcia before resuming their normal path from Sants. This means the five city-centre stations of Torre Baró, Fabra i Puig, La Sagrera-Meridiana, Arc de Triomf, and Plaça Catalunya are without R4 service.
  • R1 and RG1 Lines: Service on these lines, which connect the Maresme coast to the city, was curtailed. Trains from the north are now terminating at Badalona station. Renfe has advised passengers to continue their journeys into Barcelona using alternative transport, primarily the metro system.

The R3 line, which also uses parts of the network, was unaffected by this specific incident as it is already subject to long-term closures due to major engineering works, a situation that has previously been compounded by unrelated landslides further up the line.

Cause Under Investigation as Repairs Continue

In a statement, Adif confirmed that the fire had damaged the crucial signalling systems that control train movements safely through the tunnel. El Periódico reported that technicians were immediately dispatched to assess and repair the burnt cabling. However, as of late Tuesday evening, officials had not provided an estimated time for the full resumption of normal services, indicating that repairs could be complex.

Authorities continue to investigate the cause of the wiring fire. While some initial reports suggested the fire originated near the tracks but was external to the infrastructure, Adif later clarified the incident involved wiring within the tunnel itself. This distinction is critical for determining responsibility and preventing future occurrences.

A Network Under Strain

Compounding the travel misery on Tuesday, a separate and unrelated infrastructure fault between Cunit and Sant Vicenç de Calders created severe delays on the R2Sud line. While official channels warned of delays exceeding 15 minutes, real-time data from Renfe’s own tracking system showed some services running between 46 and 72 minutes late.

This situation was particularly difficult for commuters in the Baix Penedès and Garraf regions, as service on that part of the line already operated at a reduced frequency of just two trains per hour in each direction. This reduction was due to maintenance works that began on Monday in the Garraf tunnels, leaving passengers with few alternatives when further problems arose.

For now, commuters are advised to check the latest service updates on the official Rodalies de Catalunya and Renfe websites before travelling as repair work in the Plaça Catalunya tunnel continues.