Madrid's Cercanías rail network suffered major disruption early Friday after a power supply failure at Atocha station coincided with the start of a critical phase of track works. The outage began before dawn, causing widespread delays, train stoppages and sudden changes to regular routes, information from official Cercanías updates at 6:32 a.m. The disruption was directly linked to ongoing construction at Atocha, where a new track layout is being installed to increase the Sol tunnel's capacity by a third.
By mid-morning, most lines were gradually returning to normal, but the C-3 and C-4 routes still faced impressive delays and altered services. Adif, the public rail infrastructure manager, said on its X account that it was addressing the power supply issue as quickly as possible, while warning that delays would continue until the problem was resolved. The Atocha works aim to increase operating capacity for Cercanías lines C-3, C-4 and C-5. Renfe said the goal is to expand Atocha's capacity for those lines, with work scheduled for lower-demand weekends to limit disruption.
Adding to the morning's problems, a separate technical fault around 8 a.m. forced the suspension of service between Colmenar and Tres Cantos on the C-4b line. The incident, traced to a malfunction in the traffic regulation systems at Colmenar Viejo, was resolved within hours. Trains resumed service, and frequencies gradually improved. Throughout the morning, images and videos posted on social media showed crowded platforms and long queues for escalators, illustrating the disruption commuters faced.
Atocha has seen repeated problems this week, with a similar breakdown on Wednesday causing delays, stoppages and route changes. The latest incidents came as a new phase of works began at Atocha Cercanías, with service impacts scheduled to continue until July 22. During this period, the C-3 line (Aranjuez-Chamartín) will start and end at Villaverde Bajo, requiring passengers to transfer to C-4 trains to continue to Atocha and Chamartín. The C-4a route (Parla-Alcobendas/San Sebastián de los Reyes) is suspended between Atocha and Parla, with trains running only between Atocha and Alcobendas/San Sebastián de los Reyes. Travelers heading to Parla must change to C-4b trains, which are operating as normal. The C-5 line (Humanes-Móstoles El Soto) will also start and end at Atocha, where passengers must transfer for journeys toward Humanes, Fuenlabrada or Móstoles-El Soto.
More changes are planned: from July 23 to August 16, only the C-5 will be affected, with a complete closure between Villaverde Alto and Embajadores. During this period, trains between Humanes/Fuenlabrada and Villaverde Alto, as well as between Móstoles El Soto and Embajadores, will run every 10 minutes. Shuttle trains will link Villaverde Alto and Méndez Álvaro, stopping at Puente Alcocer, Orcasitas and Doce de Octubre, every 35 minutes. Further works from August 1 to 28 will affect lines C-2, C-7, C-8a, C-8b and C-10, but only service frequencies will change.
Under separate weekend arrangements tied to Adif's Atocha works, Renfe scheduled C-5 trains on the Móstoles-El Soto-Humanes route to start and end at Atocha until 10 a.m. on October 17-18 and October 24-25. Passengers continuing beyond Atocha were told to change to another C-5 train at the station. Normal service was planned for the rest of each day. The arrangement reflects the wider effort to reorganize train movements through Atocha and increase capacity for C-3, C-4 and C-5.
The disruptions come as Madrid's transport system faces wider challenges and regional tensions. Recent disputes over public transport card funding between Madrid and other regions, including Catalonia and Galicia, have exposed the difficulty of coordinating mobility policies across Spain. A related report on regional funding disagreements is available in this analysis of Madrid's transport card funding standoff with Catalonia.
Madrid's Cercanías network is one of Spain's busiest, serving hundreds of thousands of daily commuters. Atocha is a central hub, and disruptions there can ripple across the city and surrounding areas. The current works form part of a long-term plan to modernize infrastructure and increase operating capacity. Temporary route changes and transfers are intended to keep services moving as construction progresses. Authorities continue to urge travelers to check service updates and plan for possible disruption.
