also: レイルパス
noun
rail pass
A ticket allowing unlimited train travel within a certain period or area, often used by tourists.
日本を旅行するなら、JRのレールパスを買ったほうがいいよ。
If you're traveling in Japan, you should buy a JR rail pass.
Spelling with interpunct; rarely used in practice.
Borrowed from English 'rail pass'.