Eligibility is described in the call document, but general eligibility seems to be related to projects located in an urban node and part of a Sustainable Urban Mobility Plan.
For other eligibility criteria, see https://ec.europa.eu/info/funding-tenders/opportunities/docs/2021-2027/cef/wp-call/2024/call-fiche_cef-t-2024-sustmobgen_en.pdf.