TRB's Transit Cooperative Research Program (TCRP) Web Only Document 70: Improving the Resilience of Transit Systems Threatened by Natural Disasters, Volume 2: Research Overview summarizes elements of the research effort that offers practices for transit systems of all sizes to absorb the impacts of disaster, recover quickly, and return rapidly to providing the services that customers rely on to meet their travel needs. It also explores additional research needs that have been identified during the course of the study. The report is accompanied by Volume 1: A Guide, Volume 3: Literature Review and Case Studies, and a database called resilienttransit.org to help practitioners search for and identify tools to help plan for natural disasters.