As shocking now as it was on its original 1958 release, Cairo Station is the great Egyptian director Youssef Chahine’s masterpiece, a street-level exposé of sexual obsession and working-class madness that’s as grimy and claustrophobic as its setting. From its noirish opening scene, in which a scruffy newspaper hawker discovers a rag-strewn living quarters filled with cutout girlie pictures and intones, “I knew then that something was desperately wrong,” it’s clear that the film has departed from the upper-class realms of typical 1950s Arab cinema.