UCLA Luskin Interim Dean Anastasia Loukaitou-Sideris spoke to the New York Times about strategies to increase safety on New York’s subway system. A string of recent attacks, some involving firearms, have eroded many subway riders’ sense of security. To keep guns out of the subway system, officials should consider stepping up security screenings in ways that affect service as little as possible, said Loukaitou-Sideris, who co-authored a chapter of the 2015 book “Securing Transportation Systems.” In addition to conducting frequent and rigorous bag checks, transit officials could install metal detectors and X-ray machines — a more expensive option but one that the Shanghai Metro has implemented efficiently, Loukaitou-Sideris said. Transportation officials around the world have also been studying the addition of firearm-detecting sensors to fare-collection devices and ticketing machines. “You have to eliminate the opportunity to bring the gun on the train,” Loukaitou-Sideris said.