Transit Mix Concrete & Materials Company has plant locations in Arkansas and Louisiana. The company is one of the leading suppliers of concrete and building materials in Texas. Transit Mix Concrete & Materials Company is a part of Trinity Industries, which serves clients in the energy, transportation and construction sectors. Trinity Industries business segments include rail, inland barge, construction products, and railcar leasing and management services groups. The company operates Standard Forged Products, which is one of the largest railcar axle manufacturers in North America. It provides a variety of propane tanks through Trinity Containers. Trinity Industries Trinity Marine Products manufactures inland barges.