The rail pass will pay for itself after about two trips.

火车月票大约只需乘两次车就够本了。

《牛津词典》

Is there any discount for the USA Rail pass?

美国铁路乘车证有折扣吗？

youdao

Hahn, who lives on 200 euros a week and has his rent paid by his mother, said he wanted to use some of the rest of the cash to finance his studies and buy a rail pass, RTL said.

目前，哈恩每周的生活费为200欧元，房租一直靠母亲资助。他表示，在父母办完婚事后，他将用剩下的钱去读书并为自己买一张德国的火车通票。

youdao

But since years of campaigning have failed to persuade governments either to extend rail electrification north from Edinburgh or to build a western by-pass, there is doubt that Edinburgh will be prepared to pay for it.

ECONOMIST: The wealth effect

To be sure, some infrastructure projects might pass that cost-benefit test (perhaps electric grid modernization, or unclogging strategic rail bottlenecks).

WSJ: Opinion: Corporate Tax Cuts Needed