Brussels Metro to Face Sunday Disruptions This Summer

Brussels metro services on lines 1 and 5 will be disrupted on four Sundays this summer as the city’s public transport operator STIB/MIVB continues testing a new Communication Based Train Control (CBTC) signaling system, the company announced on Thursday. The disruptions will occur on Sunday mornings until 12:30 PM, with replacement bus services provided on affected segments.

Disruption Schedule

The testing program will affect metro services on two distinct segments across four dates. On July 5 and July 19, metro line 1 service will be limited to Merode station, with trains diverted toward Herrmann-Debroux. Replacement buses will run between Merode and Stockel (Stokkel). On August 2 and August 30, metro line 5 service will be limited to Gare de l’Ouest (Weststation), with replacement buses operating between Gare de l’Ouest and Érasme (Erasmus).

According to RTBF, STIB confirmed that the testing is scheduled for Sunday mornings specifically because the network is less frequented during those hours, minimizing disruption to the majority of commuters.

Modernizing an Aging System

The disruptions are part of a broader effort to replace the Brussels metro’s original fixed-block signaling system, which dates back to the network’s opening in 1976. The new CBTC technology uses wireless communication between trains and track equipment, allowing for more flexible and reliable traffic management while maintaining maximum safety standards.

“The installation is finalized on the branches toward Erasmus and Stockel and is now being tested,” STIB stated in its press release, as reported by La Libre. The new system will make traffic organization “more reliable and flexible” while keeping safety at the highest level.

The installation has required significant infrastructure work, including over 100 kilometers of cables, 100 signals, and 1,500 beacons across the network. The heterogeneous nature of the infrastructure — some sections running through tunnels and others at surface level — has complicated the installation process.

Broader Modernization Program

The CBTC installation is part of a wider modernization initiative that includes the acquisition of new M7 metro trains and the adaptation of older M6 rolling stock. As Bruzz reports, the new M7 trains are already in service on lines 1 and 5, having been equipped with CBTC from the factory. The older M6 trains are being retrofitted to work with the new system, with the entire fleet expected to be ready by the end of 2026.

STIB noted that “the installation of CBTC is part of a broader program to modernize the metro network. This includes, among other things, the new signaling, the acquisition of new M7 metro trains, and the adaptation of older metro trains.”

Future Timeline

By the end of 2026, the segment between Jacques Brel and Merode is scheduled to be equipped with CBTC. Installation on the Herrmann-Debroux branch is expected to be completed in early 2027. The CBTC system will enter full commercial service once installation and testing are finalized across the entire length of lines 1 and 5.

Looking further ahead, lines 2 and 6 will eventually receive a light version of CBTC, allowing the new M7 trains to operate across the entire metro network. This phased approach reflects the complexity of retrofitting a modern signaling system onto infrastructure that has evolved over five decades.

What Commuters Need to Know

Approximately 400,000 daily users of lines 1 and 5 are advised to plan alternative routes on the affected Sunday mornings. While replacement bus services will partially mitigate the disruption, buses will be slower than metro service. Commuters should allow extra travel time or consider alternative transport options on:

• Sunday, July 5 — Line 1: Merode to Stockel closed until 12:30 PM
• Sunday, July 19 — Line 1: Merode to Stockel closed until 12:30 PM
• Sunday, August 2 — Line 5: Gare de l’Ouest to Érasme closed until 12:30 PM
• Sunday, August 30 — Line 5: Gare de l’Ouest to Érasme closed until 12:30 PM

Looking Ahead

Once fully operational, CBTC will represent a generational upgrade for Brussels’ metro system, enabling increased frequency and capacity on the city’s busiest metro lines. The technology also positions the network for potential future automation, though this would require additional infrastructure such as platform screen doors.

The summer testing program marks a significant milestone in a project that has been years in the making, bringing Brussels one step closer to a modern, more reliable metro system for the long term.