Engine Houses on the Portage

NPS

Engine House 6 foundation stones

Overview
The Allegheny Portage Railroad scaled the 1,400-foot elevation of the Allegheny Mountains in west central Pennsylvania. Built as part of Pennsylvania's canal system, the Portage Railroad allowed passengers and goods to be moved between Johnstown and Hollidaysburg while on their way from Pittsburgh to Philadelphia. Completed in 1843, the Portage Railroad boasted four massive stone viaducts, more than 72 stone culverts, the first railroad tunnel in the country, 10 stationary steam powered engine houses, and 36.65 miles of railway.

Operation
The Portage consisted of 11 relatively level horizontal passages that were linked by 10 'steep' inclined planes. The inclines were generally 0.5 mile in length, while the levels ranged from 0.15 mile to 14 miles. The gradient on the inclines could, by law, be no greater than 12%. The steepest of the inclines was Incline 8 at 9.9%

Railroad cars, or sometimes sectional canal boats, were pulled up or lowered down the inclines by stationary steam engines (30 to 35 horsepower), using a hemp rope approximately 7 inches in circumference. This rope was later replaced with wire cable. The ascending or descending cars were counterbalanced with other cars when possible. The stationary steam engines that drove the hoist mechanisms were at the top of the inclines; hitching sheds at the bottom.

Contents of the Engine Houses
At the head of each incline was an engine house built of wood. It contained the stationary steam engine, wheels, gears, hydraulic pistons, vertical 8-foot wheels, horizontal 9-foot by 7-inch sheaves, and wells approximately 3 feet wide and 8 feet deep.

The cast iron wheels or sheaves that drove the hoist mechanism were placed beneath the railway system. The use of these mechanical features helped make the most efficient use of power and reduced the strain on the steam engines. The well accommodated suspending weights and connecting chains that allowed the carriage to be drawn backward and forward.

No drawings or specifications for structures along the Allegheny Portage Railroad have been found despite repeated investigations.

Engine House 6
On April 1, 1833, James Stackpole, William Woodburn, and H. Simsonton won a contract to build "An Engine House and Road Shed at the Head of the Plane [incline 6], and a Road Shed at the foot of the plane together with all the Masonry Excavation & Connected with the Same." The engine house at the head of incline 6 was completed by May 30, 1834.

In 1852 the structure blew up and a second engine house was built. After the railroad was abandoned the engine house was converted to a barn. The foundations were recycled by the Pennsylvania Railroad for use in other buildings. Over time many other changes occurred. The current shelter helps to preserve what remains.

Engine House 6 Exhibit Shelter
The stationary steam engine and gears exhibit in Engine House 6 were designed and produced by Fred Connacher. He made many of the other models on display in the visitor center as well. A local history buff, Mr. Connacher did the research and study to design the exhibits as accurately as possible and built them as if they could be turned on and used immediately.