Smart card in Taipei, EASYCARD, YOYO card in Taipei MRT system

Smart Card used in Taipei is EASYCARD

EASYCARD is called 悠遊卡, yōuyóu kǎ in Chinese, that sound similar as yoyo card.

Most Taiwanese don't know what is easy card.
I think you can say "yoyo card" is much better.

Public Transportation in Taiwan

Taiwan had mountains from south to north.

And the Railways and Highway are circle system.