Pennsylvania Gravity
Dunmore, Lackawanna County, Pennsylvania
Marker Inscription
The Pennsylvania Coal Co. gravity railroad was in operation between lower Pittston and Hawley from 1850 to 1884. It crossed the highway by overhead trestle near this point. This was plane No. 7.
Erected by Pennsylvania Historical and Museum Commission
The Story
From 1850 to 1884 the Pennsylvania Coal Company operated a gravity railroad between lower Pittston and Hawley, moving anthracite across the rugged coal country of northeastern Pennsylvania. Near this point the line crossed the highway on an overhead trestle at what was designated Plane No. 7 — one of the inclined planes that let gravity and stationary engines move loaded cars over the hills. It was part of a vast network built to carry coal out of the region.
Why it matters
Gravity railroads like this one were the ingenious backbone of the anthracite trade, engineering that fueled the industrial growth of 19th-century America.
The story behind this marker
AI contextThe era
By the middle of the 19th century, northeastern Pennsylvania sat on top of one of the most valuable fuels in the country: anthracite, the hard, clean-burning coal that heated cities and fed the furnaces of a rapidly industrializing nation. The trouble was never finding the coal — it was moving it. The mines lay in rugged, hilly country, and the markets lay miles away, across ridges that no ordinary road or early locomotive could easily climb.
That was the world into which the Pennsylvania Coal Company's gravity railroad was born. From 1850 onward, it threaded the country between lower Pittston and Hawley, a stretch of the anthracite region where the landscape itself set the terms. Engineers answered the hills not by fighting them but by using them.
The spot near this marker was one link in that chain — the place where the line rode over the highway on an overhead trestle, at the point designated Plane No. 7. The numbered planes were the heart of the system, and this was simply one of them, doing its work day after day in a busy industrial corridor.
People & events
A gravity railroad worked on a beautifully simple idea. Loaded cars, heavy with coal, were let down the grades by their own weight, their speed checked by brakes and cables. To lift the empty cars back up the slopes, the line used inclined planes — stretches of track where stationary steam engines hauled the cars uphill on ropes or chains before gravity took over again on the next descent.
The planes were numbered along the route, and this was Plane No. 7. Each one represented a careful piece of engineering: a grade calculated, an engine house built, cables strung and maintained by crews who knew that a snapped line or a failed brake could turn a routine run into a disaster.
For thirty-four years, from 1850 to 1884, this line carried coal across the hills. It ran until better technology — the steam locomotives and conventional railroads that were spreading everywhere in these decades — finally made the old gravity system obsolete. When it closed, an entire way of moving freight closed with it.
Its place in the American story
Anthracite was one of the fuels that powered America's industrial rise. It heated homes in the growing cities of the Northeast and drove the boilers of factories and forges. But coal in the ground is worth nothing until it can be delivered, and in this rough country the gravity railroads were the ingenious solution that unlocked the wealth beneath the hills.
They belong to a hopeful, inventive chapter of American engineering — the same restless problem-solving that produced canals, early railroads, and the great transportation networks of the 1800s. Systems like this one were a bridge between the age of animal-and-water power and the age of the locomotive.
That this line lasted from 1850 to 1884 and then gave way tells the larger story in miniature: American transportation was reinventing itself faster than almost anywhere on earth, and even a marvel could be outrun within a single working lifetime.
If you visit
Stand near this point and picture what is no longer here: an overhead trestle carrying loaded coal cars across the road above you, and beyond it the graded slope of Plane No. 7 climbing away into the hills. The tracks and trestles are long gone, but the lay of the land that made them necessary has not changed.
Look at the terrain itself — the ridges and grades that forced 19th-century engineers to be clever. That topography is the real monument. Once you know a gravity line ran through here, the hills stop being scenery and start reading like a set of engineering problems that people actually solved.
It makes a fine stop on a drive through Pennsylvania's coal country, where markers, old rail beds, and mining-town main streets add up to a landscape shaped from top to bottom by anthracite. Give yourself a moment to imagine the creak of cables and the rumble of cars, and this quiet crossing turns into a doorway to an industrial age.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
Own a business near here? Add it to the map.
Themes & tags
Nearby & related markers
The "Pioneer" marker
Scranton, PA
In the mid-19th century, northeastern Pennsylvania's anthracite fields ran on ingenious gravity railroads — lines that let loaded coal cars coast downhill by their own weight, with stationary steam engines hauling the empties back up a chain of inclined planes. The Pennsylvania Coal Company's route carried anthracite between the mines around Pittston and the canal at Hawley for more than three decades. This surviving 'Pioneer' car, retired when the gravity line gave way to conventional steam locomotives, was handed over to the City of Scranton in 1909 as a relic of that vanished technology.
William W. Scranton (1917-2013)
Scranton, PA · est. 2016
William W. Scranton belonged to the family whose name the city bears, and he came of age as its anthracite economy was fading. A World War II pilot, he served in Congress and then as governor of Pennsylvania in the 1960s, pushing to modernize the state's industry, highways, schools, and welfare programs. His later roles as a United Nations ambassador and adviser to presidents made him a national figure across decades of public life.
First Electric Cars
Scranton, PA · est. 1948
On November 30, 1886, Scranton launched what is celebrated as the first street railway system in the United States built entirely for electric operation, running between the city center and the Green Ridge section. In an age when most urban transit still relied on horses, this was a bold leap into a new technology. The achievement earned Scranton its enduring nickname, the Electric City.
Lackawanna Iron
Scranton, PA · est. 1947
Long before Scranton was a city, iron was already being forged in the woods of Slocum Hollow as early as 1797. In 1840 the Scranton family and their partners launched the works that became the Lackawanna Iron Company, and in 1847 the furnaces here rolled iron rails for the Erie Railroad — helping tie together the nation's booming rail network. The company added steelmaking in 1875, riding the Gilded Age industrial surge, before the operation finally closed in 1902.