Identification reached 56 of 69 dead in Urda, all Spaniards, as investigation narrowed on Adif's Atocha control centre for leading to the collision. Reconstruction detailed 22 minutes with two warnings from the stopped Iryo and repeated LZB failures, over 1,700 trains affected in two years, prompting Renfe to order drivers to cap speed at 40 km/h without LZB. The investigating judge urgently demanded more crane operators to avoid halting search work and banned dissemination of victim images. Politically, Sánchez kept Transport Minister Puente to manage the crisis despite polls showing 74% demanding his exit and PSOE allies joining pressure, while the PP announced it would join the case and a first post-crash poll gave PP-UPN 139 seats against PSOE 106. The government announced an aid package for Tuesday.
In Barcelona, massive Mossos deployment deterred a new Blocus call, with one alleged ideologue jailed.