The bill expands public transportation resilience improvement grants to assist in financing activities such as flood mitigation, equipment replacement, and emergency response strategies to address climate change impacts. It also defines terms like "environmental justice community" and "medically underserved community," emphasizing their consideration in grant allocations. The bill increases funding for public transportation resilience improvements along with additional allocations for the fiscal year 2026. It requires the Secretary of Transportation to submit annual reports to Congress detailing the implementation of the grant program and highlighting projects benefiting vulnerable communities. The bill aims to enhance the resilience of public transportation systems against climate change impacts and prioritize support for underserved and environmentally at-risk communities.