SMART is the largest railroad operating union in North America, with more than 500 locals dedicated to the transportation industry. SMART represents employees on every Class I railroad, as well as employees on many regional and shortline railroads. It also represents bus and mass transit employees on approximately 45 bus and transit systems and has recently grown to include airline pilots, dispatchers and other airport personnel.

Membership is drawn primarily from the operating crafts in the railroad industry and includes conductors, brakemen, switchmen, ground service personnel, locomotive engineers, hostlers, sheet metal workers and workers in associated crafts. More than 1,800 railroad yardmasters also are represented by the SMART. SMART’s 8,000 bus and transit members include drivers, mechanics and employees in related occupations.