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plural public purses
(economics, government, idiomatic) A quantity of money collected by a government through taxation and other methods, and used for public purposes; public funds, public money. quotations examples
This means that while initial funding will come from the public purse, landowners along the route will eventually pay back a share of the uplift in land values created by the new line.
2021 February 10, “Network News: Additional Funds Enable Preparatory Work for Ashington Reopening”, in Rail, number 924, Peterborough, Cambridgeshire: Bauer Media, page 8