The Public Transit Infrastructure Fund (PTIF) was a federal program that provided funding for transit capital projects across Canada. Launched in 2016, PTIF supported rehabilitation and modernization of transit systems, helping municipalities purchase buses, upgrade stations, and improve accessibility. The program operated on a cost-sharing basis, with federal contributions matched by provincial and municipal funding. PTIF was part of broader federal infrastructure investments and has been succeeded by other programs under the Investing in Canada Infrastructure Program. Federal transit funding helps municipalities afford major capital purchases and improvements they couldn't finance alone.