A ferry slip is a specialized docking facility that receives a ferryboat or

train ferry A train ferry is a ship (ferry) 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 ...

. A similar structure called a barge slip receives a

barge Barge nowadays generally refers to a flat-bottomed inland waterway vessel which does not have its own means of mechanical propulsion. The first modern barges were pulled by tugs, but nowadays most are pushed by pusher boats, or other vessels ...

car float A railroad car float or rail barge is a specialised form of lighter with railway tracks mounted on its deck used to move rolling stock across water obstacles, or to locations they could not otherwise go. An unpowered barge, it is towed by a t ...

that is used to carry wheeled

vehicle A vehicle (from la, vehiculum) is a machine that transports people or cargo. Vehicles include wagons, bicycles, motor vehicles (motorcycles, cars, trucks, buses, mobility scooters for disabled people), railed vehicles (trains, trams), ...

s across a body of water. Often a ferry intended for motor vehicle transport will carry its own adjustable ramp - 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 A railcar (not to be confused with a railway car) is a self-propelled railway vehicle designed to transport passengers. The term "railcar" is usually used in reference to a train consisting of a single coach (carriage, car), with a drive ...

are carried by the ferry the apron will have tracks 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

is for the carriage of

San Francisco example

In the example shown below, a

tugboat A tugboat or tug is a marine vessel that manoeuvres other vessels by pushing or pulling them, with direct contact or a tow line. These boats typically tug ships in circumstances where they cannot or should not move under their own power, su ...

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. Unlike the electric motor drive used here and elsewhere, the Point Richmond 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. 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, California San Francisco (; Spanish for " Saint Francis"), officially the City and County of San Francisco, is the commercial, financial, and cultural center of Northern California. The city proper is the fourth most populous in California and 17th ...

, south of

China Basin San Francisco, in the US state of California, has both major, well-known neighborhoods and districts as well as smaller, specific subsections and developments. While there is considerable fluidity among the sources, one guidebook identifies five m ...

was a principal crew change point for maritime operations of the

Santa Fe Railroad The Atchison, Topeka and Santa Fe Railway , often referred to as the Santa Fe or AT&SF, was one of the larger railroads in the United States. The railroad was chartered in February 1859 to serve the cities of Atchison and Topeka, Kansas, and ...

. 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

San Francisco Belt Railroad The San Francisco Belt Railroad was a short-line railroad along the Embarcadero in San Francisco, California. It began as the State Belt Railroad in 1889, and was renamed when the city bought the Port of San Francisco in 1969. As a state owned ...

, 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 A stevedore (), also called a longshoreman, a docker or a dockworker, is a waterfront manual laborer who is involved in loading and unloading ships, trucks, trains or airplanes. After the shipping container revolution of the 1960s, the number ...

s and on the docks by crews of longshoremen, 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 The San Francisco Peninsula is a peninsula in the San Francisco Bay Area that separates San Francisco Bay from the Pacific Ocean. On its northern tip is the City and County of San Francisco. Its southern base is Mountain View, south of Palo Alt ...

, railcars were barged about the bay, both by the Santa Fe and by the

Southern Pacific The Southern Pacific (or Espee from the railroad initials- SP) was an American Class I railroad network that existed from 1865 to 1996 and operated largely in the Western United States. The system was operated by various companies under the ...

. 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 A maritime museum (sometimes nautical museum) is a museum specializing in the display of objects relating to ships and travel on large bodies of water. A subcategory of maritime museums are naval museums, which focus on navies and the milita ...

. Most traffic would be taken across the bay to Oakland or Richmond 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 The North Coast of California (also called the Redwood Empire or the Redwood Coast in reference to the dense Sequoia sempervirens, redwood forests throughout the region) is a region in Northern California that lies on the Pacific coast between Sa ...

) passing through a slip at Tiburon on

Richardson Bay Richardson Bay (originally Richardson's 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 ...

. San Francisco is no longer a significant port for freight as the mode of transport is now in

containers A container is any receptacle or enclosure for holding a product used in storage, packaging, and transportation, including shipping. Things kept inside of a container are protected on several sides by being inside of its structure. The term ...

, carried by

container ship A container ship (also called boxship or spelled containership) is a cargo ship that carries all of its load in truck-size intermodal containers, in a technique called containerization. Container ships are a common means of commercial intermoda ...

s. The containers are loaded on and off ships at the

Port of Oakland The Port of Oakland is a major container ship facility located in Oakland, California, in the San Francisco Bay. It was the first major port on the Pacific Coast of the United States to build terminals for container ships. As of 2011 it was the f ...

across the bay, conveniently close to the land modes of container transport -

railroad Rail transport (also known as train transport) is a means of transport that transfers passengers and goods on wheeled vehicles running on rails, which are incorporated in tracks. In contrast to road transport, where the vehicles run on a pre ...

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 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 The Port of New York and New Jersey is the port district of the New York-Newark metropolitan area, encompassing the region within approximately a radius of the Statue of Liberty National Monument. It includes the system of navigable water ...

, transferring freight cars between

Greenville Yard Greenville Yard is a freight rail yard in the Port of New York and New Jersey. It is located on Upper New York Bay in Jersey City, New Jersey adjacent and north of Port Jersey. Originally developed in 1904 by the Pennsylvania Railroad, it was la ...

in Jersey City, New Jersey, and Bush Terminal Yard in

Brooklyn, New York Brooklyn () is a borough of New York City, coextensive with Kings County, in the U.S. state of New York. Kings County is the most populous county in the State of New York, and the second-most densely populated county in the United States, be ...

. They are run by

New York New Jersey Rail, LLC New York New Jersey Rail, LLC is a switching and terminal railroad that operates the only car float operation across Upper New York Bay between Jersey City, New Jersey and Brooklyn, New York. Since mid-November 2008, it has been owned by t ...

Gallery

Image:DS-Ammonia Mæl 2004 SRS.jpg, Two track rail apron and

Tinnsjø railway ferry Tinnsjø railway ferry was a Norwegian railway ferry service on Lake Tinn that connected the Rjukan Line and Tinnoset Line. The long ferry trip made it possible for Norsk Hydro to transport its fertilizer from the plant at Rjukan to the port in ...

SF Hydro SF ''Hydro'' was a Norwegian steam powered railway ferry that operated in the first half of the 20th century on Lake Tinn in Telemark. It connected with the Rjukan Line and Tinnoset Line, at Mæl and Tinnoset, operating between 1914 and 1944. ...

Image:LCTC ferry EWW in winter 2.jpg, Automobile apron and ferry of the

Lake Champlain Transportation Company The Lake Champlain Transportation Company (LCTC or LCT) is a vehicle ferry operator that runs three routes across Lake Champlain between the US states of New York and Vermont. From 1976 to 2003, the company was owned by Burlington, Vermont, bus ...

File:Ferry slip at Port of Dover.JPG, modern ferry slip at the Port of Dover Image:Woodf3a.jpg,

Woodfibre, British Columbia Woodfibre, originally Britannia West, was a pulp mill and at one time a small company town, on the west side of upper Howe Sound near Squamish, British Columbia. The mill closed in March 2006. History In 1912, a mill opened at the site where Mill ...

File:The former ferry slip of Wujing–Zhoujiadu Railway at Duhang.JPG, The only ferry slip in the history of Shanghai railway transportation.

References

{{DEFAULTSORT:Ferry Slip Water transport Train ferries Coastal construction Nautical terminology

San Francisco example

Historical significance of this example

Gallery

See also

References