The Yamaguchi Line (山口線, Yamaguchi-sen) of Seibu Railway is a 2.8 km (1.7 mi) manually-driven rubber-tyred people mover that runs between Tamako in Higashimurayama, Tokyo and Seibukyūjō-mae in Tokorozawa, Saitama in Japan.

The line is the only people mover that is operated by one of Japan's major private railway companies.

In 1950, the predecessor of the line opened as an attraction ride called Fantasy Train (おとぎ列車, Otogi Ressha), running through the amusement area developed by Seibu Railway and its allies.

In 1984, the steam and battery powered railway closed for the line to be converted to a people mover.

[3] During major sporting events and concerts at venues along the line, trains operate every 10 minutes with trains passing on the single-track line at Higashi-Nakamine signal station [ja] where a passing loop is installed.