Signaling Fault Slows São Paulo Metro Line 4–Yellow, Disrupting Morning Commute

Overview

• Trains are moving at reduced speed with longer intervals between Luz and Vila Sônia due to a signaling-system instability.
• Transfers were temporarily closed at Paulista/Pernambucanas, República, Luz, and Pinheiros, with turnstiles blocked to control station access.
• The emergency PAESE operation was activated across the corridor, with at least 24 buses requested for passenger support.
• Maintenance teams are working to restore normal operations as station staff guide riders to alternatives.
• Passengers reported platform waits exceeding an hour and some trains not arriving, while other Metro and CPTM lines operated normally.