ArcGIS Pro 2.2 introduces a Features To GTFS Stops tool which:

Converts a feature class to a GTFS stops.txt file for a GTFS public transit dataset.

Note that:

A file geodatabase feature class is recommended for tool input instead of a shapefile because some field names allowed by the GTFS specification are longer than the maximum of 10 characters allowed for shapefile field names.

Disclosure: I am a consultant that makes a living selling solutions using ESRI products.

ArcGIS Pro 2.2 introduces a Features To GTFS Stops tool which:

Converts a feature class to a GTFS stops.txt file for a GTFS public transit dataset.

Note that:

A file geodatabase feature class is recommended for tool input instead of a shapefile because some field names allowed by the GTFS specification are longer than the maximum of 10 characters allowed for shapefile field names.

ArcGIS Pro 2.2 introduces a Features To GTFS Stops tool which:

Converts a feature class to a GTFS stops.txt file for a GTFS public transit dataset.

Note that:

A file geodatabase feature class is recommended for tool input instead of a shapefile because some field names allowed by the GTFS specification are longer than the maximum of 10 characters allowed for shapefile field names.

ArcGIS Pro 2.2 introduces a Features To GTFS Stops tool which:

Converts a feature class to a GTFS stops.txt file for a GTFS public transit dataset.

Note that:

A file geodatabase feature class is recommended for tool input instead of a shapefile because some field names allowed by the GTFS specification are longer than the maximum of 10 characters allowed for shapefile field names.

Disclosure: I am a consultant that makes a living selling solutions using ESRI products.