Sokolnicheskaya Line
Though Biblioteka Imeni Lenina and Aleksandrovsky Sad (then called Komintern) were built concurrently, they were not connected by transfer passages until 1938, when Aleksandrovsky Sad became part of the Arbatsko-Pokrovskaya Line. Before this the line from Aleksandrovsky Sad to Kievskaya operated as a branch of the Sokolnicheskaya Line.