Metro to invest 7.9 million euros in renovation of catenary on line 4

Avenida de América station
The public company is already carrying out works to renovate signalling on the line. The works are scheduled to affect passenger services for eight weeks, with alternative transport in operation. The date to start work is currently being studied so as to affect the minimum number of passengers

Metro de Madrid will invest 7.9 million euros in the renovation of the catenary on line 4 of the underground, which runs from Argüelles to Pinar de Chamartín stations, in accordance with an agreement reported to the Regional Government of Madrid today.

These renovation works will take some eight months to complete, and it will be necessary to suspend the service on line 4 for some eight weeks. At present, Metro de Madrid is looking at different options for the start date so as to affect the fewest number of passengers possible.

During the weeks in which the service is suspended, Metro will offer a replacement bus service to users on one of the stretches affected. The rest will have increased bus services on the normal EMT lines.

The works to be carried out are to complete the installation of a rigid catenary throughout line 4. This system of electricity transmission to the trains is characterised by greater reliability and availability and less maintenance.

In addition, the new system is prepared to work at both 1,500 watts of direct current and at the 600 watts used at present. This means that the capacity of trains on the line can be increased in the future, and energy loss can be reduced.


This project is in addition to the works that Metro is already carrying out to renovate railway signalling on line 4, with the aim of reducing train travel times, standardising the different existing systems on the line. Accordingly, the transport capacity can be improved, together with security and maintenance efficiency.

In order for all the signalling to be effective, Metro will also update the new software map on 147 trains of the 3000 and 2000 series, without this affecting service requirements.  All of this will call for an investment of more than 14.6 million euros.

The works to introduce the new system began in October last year and have an implementation time of some 21 months. At present, work is being carried out at night, with 75% already completed.


All these actions form part of the Modernisation Plan of line 4, which seeks to improve the safety and reliability of the service. Among other measures, the plan provides for the modernisation of four stations: Esperanza, Prosperidad, Arturo Soria and Alfonso XIII.

Accordingly, all wall cladding will be replaced and facilities and technology will be modernized on platforms and access ways, which will facilitate maintenance works and improve the functionality of the installations. In addition, the drainage and sanitation network in stations will be improved and extended with new waterproofing systems, new electricity conduits will be installed and these spaces will receive new furniture

The plan also provides for the removal of asbestos from facilities, both in tunnels and in stations.

The current line 4 was inaugurated in 1932 as a branch of line 2 between the stations of Goya and Diego de León. In March 1944, the line opened in its own right, following the inauguration of the stretch between the stations of Argüelles and Goya, although the branch line continued to operate independently. This was definitively included as part of the line in 1958, which allowed it to be extended between the stations of Diego de León and Alfonso XIII.

In May 1979, a new extension was completed to Esperanza station. In 1998, the line was further extended to Parque de Santa María and in April 2007, the last extension was completed to Pinar de Chamartín station.

This uneven growth caused different electrification systems to exist on the line, as well as different generation railway signalling systems, making it necessary to undertake this project to renovate equipment and systems and make them uniform.