Ferry slip
Encyclopedia
Dock (maritime)
A dock is a human-made structure or group of structures involved in the handling of boats or ships, usually on or close to a shore.However, the exact meaning varies among different variants of the English language...
facility that receives a ferry
Ferry
A ferry is a form of transportation, usually a boat, but sometimes a ship, used to carry primarily passengers, and sometimes vehicles and cargo as well, across a body of water. Most ferries operate on regular, frequent, return services...
boat or train ferry
Train ferry
A train ferry is a ship designed to carry railway vehicles. Typically, one level of the ship is fitted with railway tracks, and the vessel has a door at the front and/or rear to give access to the wharves. In the United States, train ferries are sometimes referred to as "car ferries", as...
. A similar structure called a barge slip receives a barge
Barge
A barge is a flat-bottomed boat, built mainly for river and canal transport of heavy goods. Some barges are not self-propelled and need to be towed by tugboats or pushed by towboats...
or car float
Car float
A railroad car float or rail barge is an unpowered barge with rail tracks mounted on its deck. It is used to move railroad cars across water obstacles, or to locations they could not otherwise go, and is pushed by a towboat or towed by a tugboat...
that is used to carry wheel
Wheel
A wheel is a device that allows heavy objects to be moved easily through rotating on an axle through its center, facilitating movement or transportation while supporting a load, or performing labor in machines. Common examples found in transport applications. A wheel, together with an axle,...
ed vehicle
Vehicle
A vehicle is a device that is designed or used to transport people or cargo. Most often vehicles are manufactured, such as bicycles, cars, motorcycles, trains, ships, boats, and aircraft....
s across a body of water.
Often a ferry intended for motor vehicle transport will carry its own adjustable ramp
Linkspan
A linkspan or link-span is a type of drawbridge used mainly in the operation of moving vehicles on and off a RO-RO vessel or ferry.Linkspans are usually found at ferry terminals where a vessel uses a combination of ramps either at the stern, bow or side to load or unload cars, vans, trucks and...
- when elevated it acts as a wave guard and is lowered to a horizontal position at the terminus to meet a permanent road segment that extends under water. In other cases, the ramp is installed at the ferry slip and is called a linkspan or apron. Such a ramp is adjustable to accommodate varying water heights and ferry loadings and to move it out of the way during approach and exit. If railcars
Railroad car
A railroad car or railway vehicle , also known as a bogie in Indian English, is a vehicle on a rail transport system that is used for the carrying of cargo or passengers. Cars can be coupled together into a train and hauled by one or more locomotives...
are carried by the ferry
Train ferry
A train ferry is a ship designed to carry railway vehicles. Typically, one level of the ship is fitted with railway tracks, and the vessel has a door at the front and/or rear to give access to the wharves. In the United States, train ferries are sometimes referred to as "car ferries", as...
the apron will have tracks
Rail tracks
The track on a railway or railroad, also known as the permanent way, is the structure consisting of the rails, fasteners, sleepers and ballast , plus the underlying subgrade...
for them.
In some parts of the world, the structures are also known as Linkspans and Transfer Bridges.
Similar structures are used to receive barges, particularly if the barge
Car float
A railroad car float or rail barge is an unpowered barge with rail tracks mounted on its deck. It is used to move railroad cars across water obstacles, or to locations they could not otherwise go, and is pushed by a towboat or towed by a tugboat...
is for the carriage of railcars
Railroad car
A railroad car or railway vehicle , also known as a bogie in Indian English, is a vehicle on a rail transport system that is used for the carrying of cargo or passengers. Cars can be coupled together into a train and hauled by one or more locomotives...
.
San Francisco example
In the example shown below, a tugboatTugboat
A tugboat is a boat that maneuvers vessels by pushing or towing them. Tugs move vessels that either should not move themselves, such as ships in a crowded harbor or a narrow canal,or those that cannot move by themselves, such as barges, disabled ships, or oil platforms. Tugboats are powerful for...
was positioned on the left side of the barge (our right in the apron view), pulling it with a stout rope called a springline. Nearly identical structures were used around San Francisco Bay
San Francisco Bay
San Francisco Bay is a shallow, productive estuary through which water draining from approximately forty percent of California, flowing in the Sacramento and San Joaquin rivers from the Sierra Nevada mountains, enters the Pacific Ocean...
. Unlike the electric motor drive used here and elsewhere, the Point Richmond
Richmond, California
Richmond is a city in western Contra Costa County, California, United States. The city was incorporated on August 7, 1905. It is located in the East Bay, part of the San Francisco Bay Area. It is a residential inner suburb of San Francisco, as well as the site of heavy industry, which has been...
ferry slip used water tanks as a portion of the counterweight, with the amount of water (provided by gravity from a local creek) regulated to move the apron up or down by admitting or draining water from the tanks.
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Here, three tracks are provided for loading the barge. On the barge the three tracks are spread to allow clearance for the freight cars. The slip consists of pilings and guide boards to accurately position the barge relative to the apron. Once the barge is located properly, links are lowered from the apron to engage hooks on the barge, locking the linkspan and barge together.
While the apron shown could bear the weight of a locomotive, it could not withstand the traction, so a string of flatcars was used to link the locomotive to a short string of railcars, which were then moved on or off of the barge. If a locomotive was to be moved (a rare event), it would be moved by another locomotive using the same method. The auxiliary track to the left of the headworks was for storage of the flatcar string.
Historical significance of this example
This example, located in San Francisco, CaliforniaSan Francisco, California
San Francisco , officially the City and County of San Francisco, is the financial, cultural, and transportation center of the San Francisco Bay Area, a region of 7.15 million people which includes San Jose and Oakland...
, south of China Basin was a principal crew change point for maritime operations of the Santa Fe Railroad. It is no longer in use. It remains intact but there are no longer any connecting rails along the shoreline - once the province of the Belt Line Railroad, operated along The Embarcadero by the state of California in support of maritime traffic. This was used extensively in an era when large cargo ships would contain crates or pallets of stores, moved to and from the ship's cargo holds by crews of stevedore
Stevedore
Stevedore, dockworker, docker, dock labourer, wharfie and longshoreman can have various waterfront-related meanings concerning loading and unloading ships, according to place and country....
s and on the docks by crews of longshoremen
Stevedore
Stevedore, dockworker, docker, dock labourer, wharfie and longshoreman can have various waterfront-related meanings concerning loading and unloading ships, according to place and country....
, with the ship's own spar cranes and winches used for movement. Transport to and from the docks was mostly by rail. Rather than make a long trip down the San Francisco Peninsula
San Francisco Peninsula
The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates the San Francisco Bay from the Pacific Ocean. On its northern tip is the City and County of San Francisco. Its southern base is in Santa Clara County, including the cities of Palo Alto, Los Altos, and Mountain...
, railcars were barged about the bay, both by the Santa Fe and by the Southern Pacific
Southern Pacific Railroad
The Southern Pacific Transportation Company , earlier Southern Pacific Railroad and Southern Pacific Company, and usually simply called the Southern Pacific or Espee, was an American railroad....
. Southern Pacific eventually replaced their multiple tug and barge system with a single specialized ferryboat. Two ferry slips were used by Santa Fe in San Francisco, here near China Basin, and at the north edge of town near the Maritime Museum
San Francisco Maritime National Historical Park
The San Francisco Maritime National Historical Park is located in San Francisco, California, USA. The park includes a fleet of historic vessels, a visitor center, a maritime museum, and a library/research facility...
. Most traffic would be taken across the bay to Oakland
Oakland, California
Oakland is a major West Coast port city on San Francisco Bay in the U.S. state of California. It is the eighth-largest city in the state with a 2010 population of 390,724...
or Richmond
Richmond, California
Richmond is a city in western Contra Costa County, California, United States. The city was incorporated on August 7, 1905. It is located in the East Bay, part of the San Francisco Bay Area. It is a residential inner suburb of San Francisco, as well as the site of heavy industry, which has been...
for connection with the major transcontinental rail lines, with a small amount of traffic for California's northern coastal region (the so-called Redwood Empire) passing through a slip at Tiburon
Tiburon, California
Tiburon is an incorporated town in Marin County, California. It occupies most of the Tiburon Peninsula, which reaches south into the San Francisco Bay. The smaller city of Belvedere occupies the south-east part of the peninsula and is contiguous with Tiburon...
on Richardson Bay
Richardson Bay
Richardson Bay is a shallow, ecologically rich arm of San Francisco Bay, managed under a Joint Powers Agency of four Northern California cities. The Richardson Bay Sanctuary was acquired in the early 1960s by the National Audubon Society. The bay was named for William A...
.
San Francisco is no longer a significant port for freight as the mode of transport is now in containers
Containerization
Containerization is a system of freight transport based on a range of steel intermodal containers...
, carried by container ship
Container ship
Container ships are cargo ships that carry all of their load in truck-size intermodal containers, in a technique called containerization. They form a common means of commercial intermodal freight transport.-History:...
s. The containers are loaded on and off ships at the Port of Oakland
Port of Oakland
The Port of Oakland was the first major port on the Pacific Coast of the United States to build terminals for container ships. It is now the fifth busiest container port in the United States, behind Long Beach, Los Angeles, Newark, and Savannah...
across the bay, conveniently close to the land modes of container transport - railroad
Rail transport
Rail transport is a means of conveyance of passengers and goods by way of wheeled vehicles running on rail tracks. In contrast to road transport, where vehicles merely run on a prepared surface, rail vehicles are also directionally guided by the tracks they run on...
and specialized trucking. The rise of the Port of Oakland and its dominance over San Francisco as a freight port is an example of the exploitation of a disruptive technology
Disruptive technology
A disruptive technology or disruptive innovation is an innovation that helps create a new market and value network, and eventually goes on to disrupt an existing market and value network , displacing an earlier technology there...
by a competitor with a relatively insignificant investment in the older form of the technology.
Facilities very similar to those pictured above were still in commercial operation as of 2007 in the Port of New York and New Jersey
Port of New York and New Jersey
The Port of New York and New Jersey comprises the waterways in the estuary of the New York-Newark metropolitan area with a port district encompassing an approximate area within a radius of the Statue of Liberty National Monument...
, transferring freight cars between Greenville Yard in Jersey City, New Jersey
Jersey City, New Jersey
Jersey City is the seat of Hudson County, New Jersey, United States.Part of the New York metropolitan area, Jersey City lies between the Hudson River and Upper New York Bay across from Lower Manhattan and the Hackensack River and Newark Bay...
, and Bush Terminal Yard in Brooklyn, New York. They are run by New York New Jersey Rail, LLC.
See also
- DrawbridgeDrawbridgeA drawbridge is a type of movable bridge typically associated with the entrance of a castle surrounded by a moat. The term is often used to describe all different types of movable bridges, like bascule bridges and lift bridges.-Castle drawbridges:...
- FerryFerryA ferry is a form of transportation, usually a boat, but sometimes a ship, used to carry primarily passengers, and sometimes vehicles and cargo as well, across a body of water. Most ferries operate on regular, frequent, return services...
- Landing (water transport)Landing (water transport)A landing is a water terminal which may receive ferry passenger or cargo traffic from marine vessels. They may characterized by long wharves if they handle a large volume of cargo....
- Linkspan
- New York Central Railroad 69th Street Transfer BridgeNew York Central Railroad 69th Street Transfer BridgeThe 69th Street Transfer Bridge, part of the West Side Line of the New York Central Railroad, was a dock for car floats which allowed the transfer of railroad cars from the rail line to car floats which crossed the Hudson River to the Weehawken Yards in New Jersey...
- PortPortA port is a location on a coast or shore containing one or more harbors where ships can dock and transfer people or cargo to or from land....
- SlipwaySlipwayA slipway, boat slip or just a slip, is a ramp on the shore by which ships or boats can be moved to and from the water. They are used for building and repairing ships and boats. They are also used for launching and retrieving small boats on trailers and flying boats on their undercarriage. The...
- Train ferryTrain ferryA train ferry is a ship designed to carry railway vehicles. Typically, one level of the ship is fitted with railway tracks, and the vessel has a door at the front and/or rear to give access to the wharves. In the United States, train ferries are sometimes referred to as "car ferries", as...