High View Tunnel is an approximately one mile long railroad tunnel that bores through Shawangunk mountain from Bloomingburg to Mamakating. The New York, Ontario and Western Railway, more commonly known as the O&W or NYO&W, was a regional railroad with origins in 1868, lasting until March 29, 1957 when it was ordered liquidated by a US bankruptcy judge. The O&W holds the distinction of being the first notable U.S. railroad to be abandoned in its entirety. This was the main line of the New York, Ontario & Western Railroad, which was the major travel route to the Catskills in the heyday of the Sullivan County resorts.
Source: https://scenesfromthetrail.com/2016/06/27/high-view-tunnel/