The Alameda Corridor is a 20-mile (32 km) freight rail "expressway" owned by the Alameda Corridor Transportation Authority (reporting mark ATAX) that connects the ports of Los Angeles and Long Beach with the transcontinental mainlines of the BNSF Railway and the Union Pacific Railroad that terminate near downtown Los Angeles, California. Running largely in a trench below Alameda Street, the corridor was considered one of the region's largest transportation projects when it was constructed in the 1990s and early 2000s.