The Transit Profiles: 2016 Top 50 Agencies Summary is one of three profiles provided in the National Transit Database (NTD) Annual Report. This volume provides an aggregate profile of the Top 50 reporting agencies filing an NTD Annual Report for 2016 as well as individual profiles for the Top 50 reporting agencies filing an NTD Annual Report for 2016. The Top 50 agencies were determined from total unlinked passenger trips.