noun
Tōkaidō Shinkansen
Proper noun referring to the high-speed railway line connecting Tokyo and Osaka, operated by JR Central.
東京から大阪まで東海道新幹線で約2時間半です。
It takes about two and a half hours from Tokyo to Osaka by Tōkaidō Shinkansen.
General term for any Shinkansen line; 東海道新幹線 is a specific line.
Compound of 東海道 (Tōkaidō, the historical coastal route) and 新幹線 (Shinkansen, bullet train).