Omaha. Today, the Omaha Rail and Commerce Historic District celebrates this connection, along with the listing of the Burlington Train Station and the Union Station on the National Register of Historic Places. First housed in the former Herndon House, the Union Pacific Railroad's corporate headquarters have been in Omaha since the company began. Their new headquarters, the Union Pacific Center, opened in Downtown Omaha in 2004. Amtrak, the national passenger rail system, provides service through Omaha. The Greyhound Lines terminal is at 1601 Jackson St. in downtown Omaha. The terminal also provides service to Jefferson Lines, Burlington Trailways, and Express Arrow. Megabus has a stop at Crossroads Mall – N 72nd St. between Dodge St. and Cass St. – and provides service to Des Moines, Iowa City, and Chicago. Metro Transit, previously known as Metro Area Transit, is the local bus system. Omaha's position as a transportation center was finalized with the 1872 opening of the Union Pacific Missouri River Bridge that linked the transcontinental railroad to the railroads terminating in Council Bluffs. In 1888, the first road bridge, the Douglas Street Bridge, opened. In the 1890s, the Illinois Central drawbridge opened as the largest bridge of its type in the world. Omaha's Missouri River road bridges are now entering their second generation, including the Works Progress Administration-financed South Omaha Bridge, now called Veteran's Memorial Bridge, which was added to the National Register of Historic Places. In 2006, Omaha and Council Bluffs announced joint plans to build the Missouri River Pedestrian Bridge, which opened in 2008. Today, the primary mode of transportation in Omaha is by automobile, with I-80, I-480, I-680, I-29, and U.S. Route 75 (JFK Freeway and North Freeway) providing freeway service across the metropolitan area. The expressway along West Dodge Road (U.S. Route 6 and Nebraska Link 28B) and U.S. Route 275 has been upgraded to freeway standards from I-680 to Fremont. City owned Metro Transit, formerly as MAT Metro Area Transit, provides public bus service to hundreds of locations throughout the Metro. A 2017 study by Walk Score ranked Omaha 26th most walkable of fifty largest U.S. cities. Of the top 50 most walkable cities only one, Omaha, Nebraska, saw its Walk Score decline, and it only decreased 0.3 points from last year. There is an extensive trail system throughout the city for walkers, runners, bicyclists, and other pedestrian modes of transportation. Omaha is laid out