In 1892, railway workers in Indianapolis formed the first national street railway labor union, the Amalgamated Association of Street Railway Employees of America. Today that union is called the Amalgamated Transit Union (ATU).

The ATU is the largest labor organization representing transit workers in the United States and Canada. Since its founding, the ATU today has grown to over 170,000 members in 270 local unions spread across 46 states and nine provinces.

The ATU is comprised of bus, van, subway, and light rail operators, clerks, baggage handlers, and maintenance employees in urban transit, over-the-road and school bus industries, as well as paramedical personnel, ambulance operators, clerical personnel, and municipal workers.

The ATU can be found in most major cities of the United States and Canada.

ATU is affiliated with the AFL-CIO

Most information in this write up is from http://www.atu.org