The Pennsylvania Railroad Company, established in 1846 and headquartered in Philadelphia, had become by 1882 the largest railroad and transportation company in the world, with a budget second only to the United States government. Over time it acquired, merged, or owned part of 800 other rail lines and companies, and in the 1920s it carried nearly three times the traffic of other railroads; its closest rival, the New York Central, carried about 75 percent of the Pennsylvania's ton-miles. After filing for bankruptcy, the railroad transferred its railroad assets on April 1, 1976, to Consolidated Rail Corporation, or Conrail, which was purchased and split up in 1999, with 58 percent of the system going to the Norfolk Southern Railway, including nearly all of the former Pennsylvania Railroad. Rail-trails are public trails created from unused railroad lines, whose flat or gently sloping grades make them well suited for walking or bicycling. In the late 1990s, Greene County began developing a trail on the abandoned rail bed along the Monongahela River, and the Greene River Trail formally opened on May 23, 2000, with expansions completed in 2001, 2008, and 2019. In Greene County railroad development began when the Pennsylvania General Assembly granted the Monongahela Valley Railroad the right in April 1867 to build from Pittsburgh to Waynesburg; it was renamed the Pittsburgh, Virginia and Charleston Railway in February 1870, the first section from Pittsburgh to West Brownsville was completed and operations began on May 15, 1881, and the Monongahela Railroad was incorporated in 1900 as a joint venture of the Pennsylvania Railroad and the Pittsburgh and Lake Erie Railroad, with its first meeting held in January 1901 and lines from the Pittsburgh, Virginia and Charleston Railway acquired. The Pennsylvania, Monongahela and Southern Railroad was organized in 1902 under the Pennsylvania Railroad to extend the line from West Brownsville to Rices Landing; the line reached Millsboro in January 1907, the first train reached Dilworth Mine in Greene County in October 1907, the line reached Rices Landing in February 1908, the railroad reached Crucible and began service on December 15, 1913, the first regular passenger train began in Crucible on January 1, 1914, the Pennsylvania Railroad announced in 1918 that it was extending the line past Crucible to Nemacolin, where the Buckeye Coal Company's new mine and mining town were located, and the line to Nemacolin was retired in 1968 with the closure of the mine.