While embedded at MDOT MTA’s Office of Service Development in Baltimore, I created a series of dashboards that visualize static GTFS data in Tableau for easier QA/QC and analysis.  GTFS feeds are composed of a series of text files in an open-source format, meaning that every transit agency that makes its GTFS feed public is making its schedule data available in a standard format.  After processing the GTFS feed using Microsoft Excel, Microsoft Access, or R, the processed data can be displayed in Tableau.  Dashboards created for MDOT MTA included a layover evaluation tool, block chart, stringlines (Marey diagram), headway by stop, blocks by route, buses per route per hour, and span per route.