1866–1932: Ulster and Delaware Railroad In the middle of the 19th century,
Thomas Cornell, already wealthy from the steamboats he operated along the
Hudson River, saw further opportunity in developing a rail link from
Kingston across the Catskills in
Ulster County that would connect with other railroads in New York's interior serving the
Great Lakes. In 1866 he incorporated the
Rondout & Oswego Railroad, which built tracks as far west as
Roxbury in
Delaware County over the next six years before being reorganized as the
New York, Kingston & Syracuse after going bankrupt. In 1875 it became the
Ulster & Delaware Railroad (U&D) following another bankruptcy. The U&D made the line profitable through the early 20th century. It shipped
bluestone quarried in the Catskills to the river where it was shipped to
New York City for use as sidewalks, dairy products from the region's farms and coal from
Northeastern Pennsylvania. In return, passengers came upriver to spend their summers at the
Catskill Mountain House and other popular large resorts. Ferries across the Hudson also allowed passengers from that region to take what was advertised as the only all-weather route to the Catskills. In 1900 the U&D achieved Cornell's original goal, reaching
Oneonta in
Otsego County, where it interlinked with the
Delaware & Hudson Railroad's service along the
Susquehanna River. The CMRR's volunteers worked to rehabilitate the track near the reservoir with the goal of providing continuous service between its terminals. Weather incidents required repairs to the tracks, particular along the Esopus in 1987, preventing that. The 2011 flooding of
Esopus Creek caused by Hurricane Irene swept away part of the Boiceville Trestle, cutting the line in two. Repairs were impossible for the railroad to manage, and in 2016 the county declined to renew the CMRR's lease for that portion of the line.
2017–present: Rail trail The county created an advisory commission to recommend uses for the corridor. It hired Stone Consulting, which found rail trail to be the highest and best use for the section north of the reservoir. As obstacles to rail use, it noted the poor condition of the tracks, the need to replace the bridges at Butternut Creek and Boiceville, and the limited views available other than the two dikes (Stone wrote that the CMRR crews described the section between Glenford Dike and the approach to Boiceville as a "green tunnel", observing that "at , that's at least half an hour of nothing from the windows but trees and close-in forest views"). Despite the CMRR's original goal of offering a workable rail route all the way to Phoenicia, it had not included any plans for this section in its annual business plans since a 2008 washout, seeing the reservoir section as offering little possibility of increased ridership. Nor did the
memorandum of understanding between the county and the
New York City Department of Environmental Protection (DEP), which owns the land around the reservoir, on the use of the corridor at Glenford Dike even mention passenger rail use to that point, due to DEP's concerns about runoff from rail operations contaminating the reservoir. "Overall, the location, scenery, accessibility, ease-of-use, and combination of both isolation and access should produce a trail and recreation product that could provide the majority of projected trail destination use within the entire corridor", Stone concluded. "The almost complete unanimity of this opinion from so many viewpoints actually surprised us, and the environmental, political, and funding climates appear to be converging to achieve this goal." The only serious obstacle Stone saw was funding to rebuild the Boiceville Trestle, since a large
Federal Emergency Management Agency (FEMA) grant that could be used for that purpose was contingent on restoring the previous use. That issue might, the report suggested, be mitigated by reusing the beams and raising the bridge. Plans were drawn up for the rail trail in 2017 and construction began the following year on a pathway, to be surfaced in locally quarried crushed stone, except a elevated wooden boardwalk over
wetlands in one section. The surface ensures the entire route is disabled-accessible; a
permeable surface was also required by DEP. Construction, at a cost of $16.5 million ($ in ) began in 2018 and the full trail was open by the end of 2019. The Boiceville Trestle was rebuilt as a footbridge, three spans supported by continuous steel girders. To make it more flood-resistant in the future, it was extended in length to , longer than its predecessor, so it could be raised higher above the Esopus. Interpretive plaques were placed at various intervals along the trail, informing users of the history of the railroad, reservoir and region. ==Possible extension to east==