The National Transit Database (NTD) program’s Asset Inventory Module (AIM) is designed to collect basic information on assets and infrastructure applied by U.S. transit agencies to deliver service. The purpose of assembling a nationwide inventory is to improve the Federal Transit Administration’s (FTA’s) ability to project capital costs for the replacement (and necessary capital renewal activities) of existing transit assets in the future. This information supports the FTA biennial report to the U.S. Congress regarding cost estimates of transit capital. These estimates directly influence the FTA annual budget request submitted for the federal fiscal year (FFY).