Renfe has advised users in Alcobendas to use alternative means of transport following an electrical failure in Atocha that has affected lines C-3, C-4, and C-5. The incident adds to the scheduled works at the station, which will continue until the end of August.
Friday morning, July 17, began with an unexpected scenario for residents of Alcobendas and La Moraleja who use the C-4 Cercanías line. An electrical supply failure at Atocha station, combined with a second incident between Colmenar Viejo and Tres Cantos, caused delays and cancellations that forced Renfe to issue an unusual message: asking passengers to leave the trains and seek other means of transport.
The failure affected lines C-3, C-4, and C-5 from the early hours, those that run through the Sol tunnel and Atocha station, right in the middle of peak hours. For users of the C-4a, which connects Parla with Alcobendas-San Sebastián de los Reyes passing through Atocha, Sol, Nuevos Ministerios, and Chamartín, the impact was direct. The problems persisted from seven in the morning, the time of highest passenger demand throughout the day.
“It is recommended to take alternative means of transport,” read the message disseminated by Cercanías Madrid through its app and social media.
The second incident, although initially affecting the C-4b variant between Colmenar Viejo and Tres Cantos, created a domino effect that reached the C-4a trains. By sharing key stations such as Chamartín and Nuevos Ministerios, any disruption on one branch impacts the intervals of the entire line, accumulating delays that reached the Alcobendas-San Sebastián de los Reyes station, even when the direct route was not formally interrupted.
The works at Atocha, a real headache for the residents of Alcobendas
This chaos is not an isolated incident, but the starting gun for several weeks of scheduled disruptions that will continue until the end of August. The underlying cause is Renfe's most ambitious project in the Madrid Cercanías network in decades: the implementation of a new track scheme at Atocha Cercanías which, when completed, will increase the capacity of the Sol tunnel by 33%. A third more trains will be able to run through the most congested corridor of the network, but the path to that point requires cuts and restrictions.
Between July 17 and 22, the C-4a line will be suspended between Atocha and Parla, meaning that trains will start and end their journey at Atocha. Passengers who usually make the full journey from Alcobendas to southern Madrid —Legazpi, Getafe, Fuenlabrada, or Parla— will need to transfer at Atocha to continue their journey. The northern section, between Alcobendas-San Sebastián de los Reyes and Atocha, operates but with greater instability than usual.
For residents of Alcobendas needing to travel to central Madrid during this week, the Metro Line 10 is the most direct rail alternative and is not affected by the works. The intercity buses from the Regional Transport Consortium also cover part of the corridor. The most practical recommendation is to check the status of the line in real-time on the Cercanías Madrid app or by calling the customer service number 900 320 320, as incidents can deteriorate service without prior notice.
Complete works schedule: what comes after July 22
The week from July 17 to 22 is not the last one. From July 23 to August 16, the only line with a total cut scheduled will be C-5, between Villaverde Alto and Embajadores, which affects Alcobendas less directly but will continue to generate congestion at shared stations. Between August 1 and 28, several actions will affect the frequencies of lines C-2, C-7, C-8a, C-8b, and C-10.
On the weekends of August 29 and 30 and September 5 and 6, there will be two total cuts of the Sol tunnel between Atocha and Nuevos Ministerios, with provisional heads in Atocha for trains on C-3 and C-4. This last cut again directly affects the residents of Alcobendas, who on those weekends at the end of August and beginning of September will have to transfer at Atocha to continue south or to Sol.
Renfe has made a claims channel available to passengers affected by the delays this Friday and recommends planning journeys in advance. Meanwhile, residents of Alcobendas will need to arm themselves with patience and, if possible, a good plan B for the coming months.
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