Prime Minister Pedro Sánchez of Spain speaks during the 81st session of the United Nations General Assembly at the UN headquarters on Wednesday, Sept. 23, 2026. (Lexi Parra/The New York Times) By JASON HOROWITZ One month before Spain’s national elections on Nov. 29, Prime Minister Pedro Sánchez held a long meeting in Madrid’s Atocha station with officials from the train traffic control center that his government has blamed for a devastating crash that killed at least 69 people. As his…