Hierarchy classification:

1. top of the aat hierarchies
2. Agents Facet
3. Organizations (hierarchy name)
4. organizations (groups)
5. institutions (organizations)
6. [institutions by activity]

Anotations

Scope note:

Corporation or other corporate body engaged in securing, managing, and maintaining mass transportation of passengers, generally limited to buses, trains, and other ground or underground transportation methods in an urban area.