Excessive heat inside some Porto Metro carriages is disrupting service, prompting complaints from passengers. Reports indicate air conditioning malfunctions are the primary cause of the issue. The Portuguese government has acknowledged the problem and is reportedly working on solutions, though details remain scarce. Passengers have taken to social media to express discomfort with the high temperatures during commutes. This is not the first time heat has impacted the metro’s operation, raising concerns about the system’s resilience to rising temperatures. Authorities are urging patience as they address the ongoing difficulties. The disruption highlights the challenges public transport faces during increasingly frequent heatwaves.