Portage Railroad
Juniata Township, Blair County, Pennsylvania
Marker Inscription
Here was No. 6 of the ten inclined planes used to carry canal boats by rail, Hollidaysburg to Johnstown. This unique engineering feat was completed in 1834. The road was 36 miles long.
Erected by Pennsylvania Historical and Museum Commission
The Story
In the 1830s Pennsylvania stitched its canal system across the Allegheny Mountains with one of the boldest engineering answers of the age: a portage railroad that hauled entire canal boats up and over the ridge on a staircase of inclined planes worked by stationary steam engines and cables. This spot marks Plane No. 6 of the ten that lifted traffic between Hollidaysburg and Johnstown. Completed in 1834, the 36-mile line closed the last mountain gap in the water route from Philadelphia to Pittsburgh.
Why it matters
The Allegheny Portage Railroad was a national first — a mountain-crossing rail engineering feat that briefly made a coast-to-interior canal route practical and pointed the way toward the railroad age that would soon eclipse the canals entirely.
The story behind this marker
AI contextThe era
The 1830s were the height of America's canal age, a time when states poured enormous effort into building the routes they hoped would carry the commerce of a growing nation. Pennsylvania's grand answer was an ambitious network of public works meant to link the eastern seaboard with the western country beyond the mountains.
That network ran into one immovable obstacle. Canal boats need water and gentle grades, and the Allegheny Mountains offered neither. Somewhere the state's great water route had to climb over the ridge that divided its eastern rivers from its western ones—and canals cannot climb.
So along this stretch of highland in Blair County, engineers built something new to bridge the gap in the water route. The result, finished in 1834, was one of the defining engineering achievements of the early republic and a crucial piece of the state's larger transportation dream.
People & events
The device that closed the mountain gap was the Allegheny Portage Railroad, part of the Pennsylvania Main Line of Public Works. Over a 36-mile course between Hollidaysburg and Johnstown, it lifted canal boats over the Alleghenies on a series of ten inclined planes—stretches where boats were hauled up and down the steep slopes rather than floated.
This marker records Plane No. 6, one link in that chain of ten. Along each plane, cables and stationary power did the heavy lifting that neither a canal nor a level railway could accomplish, raising loaded boats over grades that would otherwise have been impassable. The line as a whole turned a mountain barrier into a passable stairway.
Completed in 1834, the system meant that traffic on the Main Line did not have to stop and start at the mountains. It was widely regarded as a wonder of its time, a demonstration that patient engineering could overcome even the sternest terrain that stood between the state's eastern and western waters.
Its place in the American story
As part of the Pennsylvania Main Line of Public Works, this route was one of the era's most ambitious bids to conquer geography and connect a coast to an interior. The nation as a whole was trying to solve the same puzzle, and few solutions were as daring as hauling whole boats across a mountain range.
For a brief and brilliant window, that ingenuity made a through route from the eastern seaboard toward the western country practical where nature had said it should be impossible. It stands among the pioneering engineering feats of the young United States.
And it foreshadowed the change that would soon sweep the country. The very rails and inclined planes that helped the canals over the mountains hinted at a technology that would not need the canals at all. Within a generation the railroad age would arrive in force and leave works like this one behind—making this site a marker of both a peak and a turning point.
If you visit
This is a place to read with your eyes on the landscape. Take in the pitch of the surrounding slopes and imagine the effort it took to move a canal boat up and over them; the mountains themselves explain why the engineers resorted to something so extraordinary.
At the site of Plane No. 6, think of the full staircase of ten planes that once carried traffic across the ridge, and let this single point stand in for the whole audacious system. It is a spot that rewards a little imagination more than a long walk.
It makes a fine stop on a route that follows the old Main Line's path through the Alleghenies. As you drive the mountain roads, keep the marker's story in the back of your mind, and the modern ease of the crossing will throw the daring of the 1830s solution into sharp relief.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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Related events
- · Allegheny Portage Railroad
- · Pennsylvania Main Line of Public Works
Themes & tags
Nearby & related markers
Portage Railroad
Allegheny Township, PA · est. 1947
The Allegheny Portage Railroad was a marvel of its age, completed in 1834 to carry canal boats over the mountains that blocked Pennsylvania's Main Line of Public Works between Hollidaysburg and Johnstown. Ten inclined planes, of which this was No. 6, hauled the boats and their cargoes up and down the slopes along a 36-mile route. The system let a single boat travel from Philadelphia toward Pittsburgh without unloading, briefly making the state a leader in transportation engineering.
Portage Railroad
Cresson Township, PA · est. 1947
This spot marks the location of Plane No. 5, one of ten inclined planes on the Allegheny Portage Railroad, an ingenious system that hauled canal boats over the mountains by rail between Hollidaysburg and Johnstown. Completed in the 1830s, it closed the last gap in Pennsylvania's Main Line of Public Works, allowing freight and passengers to cross the formidable Allegheny ridge. The road to Lilly still traces the old route over the mountain.
Altoona
Altoona, PA · est. 1947
Altoona was born of the railroad, laid out in 1849 as the mountain-base terminal from which the Pennsylvania Railroad pushed its tracks westward over the daunting Allegheny front. Within a generation the town's yards and shops made it one of the great railroading centers of the nation. In 1867 it hosted a War Governors' Conference, one of several wartime and postwar gatherings that made the city a meeting ground for state leaders.
Canal Basin
Hollidaysburg, PA · est. 1982
At Hollidaysburg, the 127-mile Juniata Division of the Pennsylvania Canal met the Allegheny Portage Railroad, an ingenious system that hauled canal boats over the mountains toward Johnstown, 36 miles west. The canal opened in 1832 and the railroad in 1834, together forming a continuous route across the formidable Allegheny barrier. Engineers marveled at the portage line, which climbed nearly 1,400 feet in just ten miles using inclined planes.