CSX and CPKC are set to enhance the SMX.

CSX Corp. and Canadian Pacific Kansas City (CPKC) have enhanced the Southeast Mexico Express (SMX) service, introducing faster transit times and more options for customers targeting new markets. Launched on May 4, 2026, the upgraded service provides significant improvements in transit times, such as a two-day journey between Atlanta and Dallas. This enhancement, stemming from infrastructure investments, aims to offer a reliable and efficient rail solution, competing effectively with trucking. The expanded service connects more origins and destinations, promoting environmentally sustainable freight transport.