West Division Street Bridge, Spanning North Branch of Chicago River at...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
Seaford Bridge, Spanning Nanticoke River at Front Street, Seaford, Sus...
Picryl description: Public domain photograph of a dock, harbor, boats, water, free to use, no copyright restrictions.
North Avenue Bridge, Spanning North Branch of Chicago River at West No...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
North Avenue Bridge, Spanning North Branch of Chicago River at West No...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
Chicago River Bascule Bridge, Franklin Street, Spanning Chicago River ...
Significance: The development of the Chicago trunnion bascule bridge occurred during the first three decades of the twentieth century. Despite the controversy over patent infringement Joseph E. Strauss charg... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Main Street Bridge, Spanning Fox River on Main Street, Green Bay, Brow...
Significance: The Main Street Bridge is a double-leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Green Bay. With its symmetrical design including fo... More
Main Street Bridge, Spanning Fox River on Main Street, Green Bay, Brow...
Significance: The Main Street Bridge is a double-leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Green Bay. With its symmetrical design including fo... More
Main Street Bridge, Spanning Fox River on Main Street, Green Bay, Brow...
Significance: The Main Street Bridge is a double-leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Green Bay. With its symmetrical design including fo... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Sault Ste. Marie International Railroad Bridge, Spanning Soo Locks at ...
Significance: The Sault Ste. Marie International Railroad Bridge has nine camelback truss spans crossing the St. Marys River with bascule and vertical lift bridge components crossing the American Locks at the S... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
St. Charles Air Line Bridge, Spanning South Branch of Chicago River, n...
Significance: Like all Strauss heel-trunnion bascule bridges, the St. Charles Air Line Bridge rotates vertically, lifting to clear the river it spans. This particular bridge is unique, however, in that its des... More
Mystic River Bridge, Spanning Mystic River at U.S. Route 1, Groton, Ne...
Significance: The Mystic River Bridge is significant as an example of the Brown Balance Beam Bascule, an innovative design that raised movable-bridge technology to a new level of refinement in the early 20th ce... More
East Division Street Bridge, Spanning North Branch Canal at West Divis...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
State Bridge No. 0302150, Spanning Bass River at U.S. Route 9, New Gre...
Significance: This single-leaf, trunnion bascule bridge is a well-preserved example of a patented Strauss articulated underneath counterweight structure. It is significant for its use of chain-driven operating... More
New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Li...
Significance: The construction of South Station in 1896-98, involved the rerouting of several of the old lines from the west and south. The New York, New Haven & Hartford Railroad constructed a six-track rollin... More
New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Li...
Significance: The construction of South Station in 1896-98, involved the rerouting of several of the old lines from the west and south. The New York, New Haven & Hartford Railroad constructed a six-track rollin... More
Colonel Alexander Scammell Memorial Bridge, Spanning Bellamy River at ...
Significance: The bridge is a representative example of a single leaf bascule lift bridge with a vertical overhead counterweight. It is the oldest of the state's three remaining bascule bridges and is the only ... More
Chicago & Alton Railroad Bridge, Spanning South Branch of Chicago Rive...
Significance: The Chicago & Alton Railroad bridge was the first Page bascule erected for railroad use. Patented by John W. Page, a Chicago engineer, the Page bascule was not as extensively built as other paten... More
Tilghman Island Bridge, Spanning Knapp's Narrows, Tilghman, Talbot Cou...
Significance: The drawbridge spanning the Knapps Narrows Channel between the mainland and Tilghman Island, Maryland, is significant as a unique engineering type and for its historical and aesthetic connections ... More
Tayco Street Bridge, Spanning Government Canal at Tayco & Water Street...
Significance: The Tayco Street Bridge is a double leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Menasha. With its symmetrical design and four hous... More
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Public domain photograph - historical image of Oregon, United States, free to use, no copyright restrictions image - Picryl description
Chicago River Bascule Bridge, Grand Avenue, Spanning North Branch Chic...
Significance: The Grand Avenue Bridge represents the "second generation" of the Chicago bascule bridge with improvements executed in the design of the counterweights, a new rack-and-pinion assembly (namely, the... More
106th Street Bridge, Spanning Calumet River at East 106th Street, Chic...
Survey number: HAER IL-150 Public domain photograph - historical image of Illinois, United States, free to use, no copyright restrictions image - Picryl description
Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memo...
Significance: As the final link in the chain of monuments which start at the Capitol building, the Arlington Memorial Bridge connects the Mall in Washington, DC with Arlington National Cemetery in Virginia. De... More
Seaford Bridge, Spanning Nanticoke River at Front Street, Seaford, Sus...
Public domain photo of a monument, historic place, free to use, no copyright restrictions image - Picryl description
North Avenue Bridge, Spanning North Branch of Chicago River at West No...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Main Street Bridge, Spanning Fox River on Main Street, Green Bay, Brow...
Significance: The Main Street Bridge is a double-leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Green Bay. With its symmetrical design including fo... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Sault Ste. Marie International Railroad Bridge, Spanning Soo Locks at ...
Significance: The Sault Ste. Marie International Railroad Bridge has nine camelback truss spans crossing the St. Marys River with bascule and vertical lift bridge components crossing the American Locks at the S... More
Lower Bank Road Bridge, Spanning Mullica River, Egg Harbor City, Atlan...
Significance: In 1926, the bascule bridge replaced an earlier swing bridge at the same location. The present bridge was erected by Hill Construction Company. The bascule portion of the bridge is an excellent ... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Dix Bascule Bridge, Spanning Rouge River at Dix Avenue, Detroit, Wayne...
Significance: The Dix Bascule Bridge is the newest of three double-leaf trunnion drawbridges constructed over the Rouge River in the 1920's. It is important in local history for its relation to the economic de... More
Dix Bascule Bridge, Spanning Rouge River at Dix Avenue, Detroit, Wayne...
Significance: The Dix Bascule Bridge is the newest of three double-leaf trunnion drawbridges constructed over the Rouge River in the 1920's. It is important in local history for its relation to the economic de... More
Dix Bascule Bridge, Spanning Rouge River at Dix Avenue, Detroit, Wayne...
Significance: The Dix Bascule Bridge is the newest of three double-leaf trunnion drawbridges constructed over the Rouge River in the 1920's. It is important in local history for its relation to the economic de... More
Chicago River Bascule Bridge, Kinzie Street, Spanning North Branch Chi...
Significance: This single-leaf bascule bridge represents the transition between the early Chicago-type bascule bridge, first employed in the West Cortland Street Bridge (see HAER No. IL-138), and subsequent imp... More
Chicago Avenue Bridge, Spanning North Branch of Chicago River at West ...
Picryl description: Public domain image of a bridge, railroad structure, train viaduct, free to use, no copyright restrictions.
State Bridge No. 0302150, Spanning Bass River at U.S. Route 9, New Gre...
Significance: This single-leaf, trunnion bascule bridge is a well-preserved example of a patented Strauss articulated underneath counterweight structure. It is significant for its use of chain-driven operating... More
New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Li...
Significance: The construction of South Station in 1896-98, involved the rerouting of several of the old lines from the west and south. The New York, New Haven & Hartford Railroad constructed a six-track rollin... More
New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Li...
Significance: The construction of South Station in 1896-98, involved the rerouting of several of the old lines from the west and south. The New York, New Haven & Hartford Railroad constructed a six-track rollin... More
New York, New Haven & Hartford Railroad, Fort Point Channel Rolling Li...
Significance: The construction of South Station in 1896-98, involved the rerouting of several of the old lines from the west and south. The New York, New Haven & Hartford Railroad constructed a six-track rollin... More
Colonel Alexander Scammell Memorial Bridge, Spanning Bellamy River at ...
Significance: The bridge is a representative example of a single leaf bascule lift bridge with a vertical overhead counterweight. It is the oldest of the state's three remaining bascule bridges and is the only ... More
Colonel Alexander Scammell Memorial Bridge, Spanning Bellamy River at ...
Significance: The bridge is a representative example of a single leaf bascule lift bridge with a vertical overhead counterweight. It is the oldest of the state's three remaining bascule bridges and is the only ... More
Chicago & Alton Railroad Bridge, Spanning South Branch of Chicago Rive...
Significance: The Chicago & Alton Railroad bridge was the first Page bascule erected for railroad use. Patented by John W. Page, a Chicago engineer, the Page bascule was not as extensively built as other paten... More
Tayco Street Bridge, Spanning Government Canal at Tayco & Water Street...
Significance: The Tayco Street Bridge is a double leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Menasha. With its symmetrical design and four hous... More
Tayco Street Bridge, Spanning Government Canal at Tayco & Water Street...
Significance: The Tayco Street Bridge is a double leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Menasha. With its symmetrical design and four hous... More
Tayco Street Bridge, Spanning Government Canal at Tayco & Water Street...
Significance: The Tayco Street Bridge is a double leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Menasha. With its symmetrical design and four hous... More
Tayco Street Bridge, Spanning Government Canal at Tayco & Water Street...
Significance: The Tayco Street Bridge is a double leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Menasha. With its symmetrical design and four hous... More
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a river, water stream, lake or pond, park or forest, natural landscape, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge over a water stream, free to use, no copyright restrictions.
Morrison Bridge, Spanning Willamette River on Morrison & Alder Streets...
Picryl description: Public domain image of a bridge, water, historic structure, free to use, no copyright restrictions.
Philadelphia, Baltimore & Washington Railroad, Darby River Bridge, Spa...
Significance: Because Pennsylvania has few low-lying areas, the bridge is one of a limited number of movable railroad structures in the state, and even more rare as an overhead-counterweight bascule bridge. Un... More
Philadelphia, Baltimore & Washington Railroad, Darby River Bridge, Spa...
Significance: Because Pennsylvania has few low-lying areas, the bridge is one of a limited number of movable railroad structures in the state, and even more rare as an overhead-counterweight bascule bridge. Un... More
Philadelphia, Baltimore & Washington Railroad, Darby River Bridge, Spa...
Significance: Because Pennsylvania has few low-lying areas, the bridge is one of a limited number of movable railroad structures in the state, and even more rare as an overhead-counterweight bascule bridge. Un... More
Philadelphia, Baltimore & Washington Railroad, Darby River Bridge, Spa...
Significance: Because Pennsylvania has few low-lying areas, the bridge is one of a limited number of movable railroad structures in the state, and even more rare as an overhead-counterweight bascule bridge. Un... More
Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memo...
Significance: As the final link in the chain of monuments which start at the Capitol building, the Arlington Memorial Bridge connects the Mall in Washington, DC with Arlington National Cemetery in Virginia. De... More
Arlington Memorial Bridge, Spanning Potomac River between Lincoln Memo...
Significance: As the final link in the chain of monuments which start at the Capitol building, the Arlington Memorial Bridge connects the Mall in Washington, DC with Arlington National Cemetery in Virginia. De... More
Seaford Bridge, Spanning Nanticoke River at Front Street, Seaford, Sus...
Public domain photograph - historical image of Delaware, United States, free to use, no copyright restrictions image - Picryl description
North Avenue Bridge, Spanning North Branch of Chicago River at West No...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
North Avenue Bridge, Spanning North Branch of Chicago River at West No...
Significance: When Chicago became a major commercial and industrial center after the Civil War, the most common American drawbridge was the swing bridge, horizontally rotating on a center pier to open two navig... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Siuslaw River Bridge, Spanning Siuslaw River at Oregon Coast Highway, ...
Significance: The Siuslaw River Bridge is historically significant as one of five Depression-era bridges that completed the Oregon Coast Highway. For Oregon's southern coastal region, the completion of these b... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Rehoboth Avenue Bridge, State Route 1A (Rehoboth Avenue) over Lewes & ...
Significance: A notable example of a Scherzer rolling lift bascule bridge and a typical example of 1920's bridge architecture. It is the second oldest bascule bridge in Delaware, out of the eleven that are sti... More
Main Street Bridge, Spanning Fox River on Main Street, Green Bay, Brow...
Significance: The Main Street Bridge is a double-leaf, Strauss Underneath Counterweight bascule bridge. It is significant as the only bridge of this type in Green Bay. With its symmetrical design including fo... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Palm Valley Bridge, County Road 210 spanning Intracoastal Waterway, Po...
Significance: The Palm Valley Bridge is the last bridge over the Intracoastal Waterway in Florida owned and operated by the U.S. Army Corps of Engineers. It is also a good example of an unaltered double-leaf b... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Broadway Bridge, Spanning Willamette River at Broadway Street, Portlan...
Significance: The Broadway Bridge is the first bascule span built in Portland and, at the time constructed, the longest in the United States. Its completion resulted in a dramatic shift in land values and busi... More
Sault Ste. Marie International Railroad Bridge, Spanning Soo Locks at ...
Significance: The Sault Ste. Marie International Railroad Bridge has nine camelback truss spans crossing the St. Marys River with bascule and vertical lift bridge components crossing the American Locks at the S... More
Chicago River Bascule Bridge, Columbus Avenue, Spanning Chicago River ...
Public domain photograph - historical image of Illinois, United States, free to use, no copyright restrictions image - Picryl description
Chicago River Bascule Bridge, Monroe Street, Spanning South Branch of ...
Significance: The development of the Chicago trunnoin bascule bridge occurred during the first three decades of the twentieth century. Despite the controversy over patent infringement Joseph E. Strauss charg... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More
Congress Street Bascule Bridge, Spanning Fort Point Channel at Congres...
Significance: The Congress Street Bridge, built in 1930, is a trunnion bascule bridge and the most recent of the five movable-truss bridges spanning the Fort Point Channel. It replaced a steam operated swing d... More