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Become a Sheet Metal Worker for Colorado Local 9 Why become a sheet metal worker. SMART the International Association of Sheet Metal Air Rail and Transportation Workers is one of North Americas most dynamic and diverse unions with 208000 members. SMARTs members ensure the quality of the air we breathe promote energy efficiency produce and provide the vital services that move products to market and passengers to their destinations. We are sheet metal workers service technicians bus operators engineers conductors sign workers welders production employees and more.