The double-track railway in this section will make it possible for inbound trains and outbound trains to pass each other freely, since the system is already established in the section between Narutaki and Tokiwa; however, this idea hasn't yet been achieved because the necessary land hasn't been ensured in other sections in which houses are densely packed.
複線化によって鳴滝～常盤間のように駅間で電車が行き違う事ができる様にする為と思われるが、残りの区間は民家が密集して、用地の確保が困難である事から実現してない。