Kotoden operates three lines. The Kotohira Line, at 32.9?km, is the longest. Its terminals are Takamatsu Chikkō Station in the center of the city, and Kotoden-Kotohira Station in the town of Kotohira. The line passes through Kawaramachi Station in the heart of Takamatsu. In all, there are 21 stations. The line has a gauge of 1435?mm. The downtown section from Takamatsu Chikko Station to Ritsurin Station is double-tracked. The line operates at 1500?VDC.
The 14.6?km long Nagao Line connects Kawaramachi Station and Nagao Station in the city of Sanuki. It links 16 stations, including its terminals, with a single 1435?mm gauge track. Equipment operates at 1500?VDC.
The shortest of the three, the Shido Line, links Kawaramachi Station and Kotoden-Shido Station in Sanuki with 12.5?km of track. It also has 16 stations, a single 1435?mm track, and 1500?VDC electrification.