noun
additional freight; extra fare; surcharge
Refers to an extra charge added to the base fare, often for express services, reserved seats, or special conditions.
特急に乗るときは割増運賃が必要です。
When you take the limited express, an additional fare is required.
Compound of 割増 (わりまし, 'extra charge, premium') and 運賃 (うんちん, 'fare, freight charge').