Spain’s largest train drivers’ union, SEMAF, has announced a nationwide strike following a series of train derailments that have shaken the country. The latest incident occurred near Barcelona on Tuesday when heavy rain caused a retaining wall to collapse onto the tracks, derailing a commuter train. The train’s driver was killed and four passengers were seriously injured, according to Reuters. Rail operator Adif reported a third derailment in the same regional network during the storm, though no casualties were reported.

Just two days earlier, a high-speed train derailed near Adamuz in Córdoba province, about 360 kilometers south of Madrid, colliding with another train and killing at least 42 people, including the driver. The back-to-back accidents have sparked nationwide concern over railway safety.

In a statement, SEMAF said it would seek criminal accountability for those responsible for ensuring railway infrastructure safety. The union had previously warned Adif in August about severe track deterioration, citing potholes, bumps, and power line imbalances causing frequent mechanical failures across several high-speed lines.