noun
Gakuento City Line
Proper noun referring to a specific railway line in Japan. The English gloss 'Gakuento City line' appears to be a typo or variant of 'Gakuen Toshi Line' (学園都市線), which is a real line in Hokkaido operated by JR Hokkaido.
学園都市線は札幌と当別を結んでいます。
The Gakuen Toshi Line connects Sapporo and Tōbetsu.
Compound of 学園 (gakuen, 'school campus') + 都市 (toshi, 'city') + 線 (sen, 'line'), referring to a railway line serving an area with many educational institutions.