From the Executive Summary: "The coronavirus pandemic struck major cities across the world quickly and with devastating impacts. Within three months of the first recorded case, many major cities were shut down, with residents forced to stay at home. In the United States, New York City became the epicenter for cases and deaths. At first, rural areas and less-dense cities saw few infections. This led some researchers and media pundits to proclaim that public transit was a major cause for the severity of urban outbreaks. Since then, however, the disease has spread to nearly every corner of the country and world and is widespread in many communities where public transit ridership is low or non-existent. Recent analyses, and a growing number of experts, have now concluded that public transit had little or no role in the spread of the disease. This report is based on a comprehensive review of United States and global research regarding COVID-19 [coronavirus disease 2019] transmission and public transit, interviews with public health experts, and our own analysis of various data sources."
American Public Transportation Association: https://www.apta.com/