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

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).

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