These areas of land were secured to enable double tracks to be laid so that trains could pass between stations; however, because the areas of land that have not yet been secured are crowded with private houses and securing this land is proving difficult, complete double-tracking for the entire route has not yet been realized.
複線化により駅間で電車が行き違うことができるようにするためと思われるが、残りの区間は民家が密集して、用地の確保が困難であることから実現してない。