Use Display GTFS in ArcGIS to visualize your GTFS stops and route shapes in ArcMap or ArcGIS Pro.
The Display GTFS Stops tool makes a feature class of stops using information from the GTFS stops.txt file.
The Display GTFS Route Shapes tool converts the information from the GTFS routes.txt and shapes.txt files into an ArcGIS feature class, allowing you to view your transit lines on a map. The output will contain one line feature for each unique shape in your GTFS data. The attributes for each line contain all the information about the routes represented by the shape. Lines can be displayed in the color designated in the routes.txt file.