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.
A commuter pass for a fixed route, while レールパス is typically a tourist pass for unlimited travel over a wider area.
Borrowed from English 'rail pass'.