sentences:  They were collectively called the or simply the , since the lines covered an incomplete city center route.The lines were combined into a single circle route following the opening of the between Susukino and Nishi-Yon-Chōme in December 2015.Almost all trams run the full circle line, with several trams running between Nishi-Yon-Chōme and Nishisen-Jūroku-Jō during the morning rush hours.