The Public Transit Infrastructure Stream is a component of federal infrastructure funding specifically dedicated to transit projects. Under the Investing in Canada Infrastructure Program, this stream supports new transit systems, extensions, and improvements to existing networks. Eligible projects include light rail, bus rapid transit, subway extensions, and transit maintenance facilities. Federal funding typically covers a portion of project costs (often 40%), with provinces and municipalities contributing the remainder. The transit stream reflects federal recognition that quality public transit supports economic growth, reduces emissions, and improves urban livability. Funding flows through agreements with provinces that select eligible projects.