BY: Rockland Report Admin
on July 29, 2026
By 1890, Rockland County was on the verge of becoming home to what would have been the world’s largest gravity-powered amusement railway.
Had it been completed, visitors would have boarded steam-powered incline cars at the foot of Dunderberg Mountain near Jones Point. After climbing nearly 900 feet to the summit, they would have transferred to open-air railway cars and coasted nearly nine miles downhill, twisting through spirals, switchbacks, tunnels, and spectacular Hudson River vistas—all without an engine.
Instead, the project ran out of money after only about a year of construction, leaving behind one of New York’s most fascinating abandoned engineering projects.
A Vision Ahead of Its Time
The railway was conceived by Henry J. Mumford, who had found success operating the famous Switchback Railway in Mauch Chunk, Pennsylvania (now Jim Thorpe).
His idea was simple: build an even larger scenic attraction within easy reach of New York City.
Visitors would arrive by Hudson River steamboat at a grand station at Caldwell’s Landing, just south of Jones Point. Plans called for:
- A massive hotel
- Restaurants
- Picnic grounds
- Observation towers
- A park at the summit
- A state-of-the-art gravity railway unlike anything in America
Tickets were expected to cost 50 cents, and developers predicted as many as 300,000 visitors each season.
Construction Begins
Work started in the spring of 1890.
Hundreds of laborers blasted through solid rock using hand drills and black powder, carving railroad grades into the rugged mountainside.
Within months they had completed:
- Much of the railway bed
- Two massive incline grades
- Large stone retaining walls
- Deep rock cuts
- A partially completed tunnel
- An impressive stone arch bridge
- Miles of construction roads
Considering every shovel of dirt and every stone was moved without modern machinery, historians consider the amount of work completed remarkable.
Then… Everything Stopped
Before a single passenger ever rode the railway, financing collapsed.
Construction halted in late 1890 or early 1891, likely after investors exhausted available capital. Workers abandoned the project almost overnight.
The rails were never installed.
The grand hotels were never built.
The first train never ran.
What’s Left Today?
More than 135 years later, hikers can still discover remarkable remnants hidden within what is now Bear Mountain State Park.
Among them are:
The Tunnel
Perhaps the most famous remnant is a partially completed tunnel, roughly 100 feet long, blasted directly through solid rock.
Although unfinished, its stonework remains remarkably intact and has become a favorite destination for adventurous hikers.
The Spiral Grades
Large sections of the railroad bed remain clearly visible.
The grades wind around Dunderberg Mountain in sweeping curves that would have carried coaster cars through two giant spirals and three dramatic switchbacks overlooking the Hudson Highlands.
Rock Cuts
In several places, workers blasted directly through cliffs, leaving impressive rock walls that still line the abandoned right-of-way.
Some unfinished drill holes where workers planned their next blasts remain visible today.
Stone Bridge
A beautifully constructed stone arch bridge still stands in the woods, another reminder of the craftsmanship invested in a railroad that never carried passengers.
Hiking the Railway Today
Modern hikers can follow portions of the abandoned railway using:
- Ramapo–Dunderberg Trail
- Timp–Torne Trail
- Jones Trail
Many sections of today’s hiking trails actually follow the original railroad grade, making for surprisingly gentle walking despite the mountain terrain.
Why It’s Still Fascinating
Unlike many abandoned railroads that were dismantled after years of service, the Dunderberg Spiral Railway never operated for even a single day.
It remains a time capsule—a nearly complete Victorian engineering project frozen in the woods.
For hikers, photographers, railroad enthusiasts, and local history buffs, it offers one of the most unique adventures in Rockland County.
Walking the trails today, it’s easy to imagine what visitors might have experienced more than a century ago: breathtaking Hudson River views, thrilling downhill rides, and one of the most ambitious tourist attractions ever proposed in the Hudson Highlands.
Photo courtesy: Rich Zecchini