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Tobin Memorial Bridge
The Maurice J. Tobin Memorial Bridge (formerly the Mystic River Bridge) is a cantilever truss bridge that spans more than two miles (3 km) from Boston to Chelsea over the Mystic River in Massachusetts. The bridge is the largest in New England. It is operated by the Massachusetts Department of Transportation and carries U.S. Route 1. It was built between 1948 and 1950 and opened to traffic on February 2, 1950, replacing the former Chelsea Bridge. The -wide roadway has three lanes of traffic on each of the two levels with northbound traffic on the lower level and southbound traffic on the upper level. Description The bridge is a three-span cantilevered truss bridge at 1,525 ft (465 m) in total length. The center span is longest at 800 ft (244 m) and the maximum truss height is 115 ft (35 m). There are 36 approach spans to the North and 32 to the South. The roadway is seven lanes wide between the shortest (439 ft; 134 m) span and the center to accommoda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mystic River
The Mystic River is a riverU.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map accessed April 1, 2011 in Massachusetts, in the United States. In Massachusett, means "large estuary," alluding to the tidal nature of the Mystic. The resemblance to the English word ' is a coincidence, which the colonists naturally followed. The Mystic River lies to the north of Boston and flows approximately parallel to the lower portions of the Charles River. Encompassing of watershed, the river flows from the Lower Mystic Lake and travels through the Boston-area communities of East Boston, Chelsea, Charlestown, Everett, Medford, Somerville, and Arlington. The river joins the Charles River to form inner Boston Harbor. Its watershed contains 44 lakes and ponds, the largest of which is Spot Pond in the Middlesex Fells, with an area of . Significant portions of the river's shores are within the Mystic River Reservation and are admin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lynn And Boston Railroad
The Lynn and Boston Railroad was a streetcar railway chartered for operations between Boston and Lynn, Massachusetts in 1859. Following a number of acquisitions, the railway was a part of a 1901 street railway merger that formed the Boston and Northern Street Railway. The Thomson-Houston Electric Company developed and implemented electrification in Lynn on the Highland Circuit route of the Lynn & Boston, the first electrified streetcar in Massachusetts with regular electric service begun November 19, 1888.The Thomson-Houston Road at Lynn, Mass.', The Electrical World, December 8, 1888, page 303Electric Railway at Lynn, Mass.', Electric Power, January 1889, page 21 The electrified cars were able to ascend the steep 8% grade into the Lynn Highlands far easier than even a team of four horses. Acquisitions * Boston and Chelsea Railroad Boston (), officially the City of Boston, is the state capital and most populous city of the Commonwealth of Massachusetts, as well as the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Reverse Curve
In civil engineering, a reverse curve (or "S" curve) is a section of the horizontal alignment of a highway or railroad route in which a curve to the left or right is followed immediately by a curve in the opposite direction. On highways in the United States reverse curves are often announced by the posting of a W1-4L sign (left-right reverse curve) or a W1-4R sign (right-left reverse curve), as called for in the Manual on Uniform Traffic Control Devices. Reverse curves on the Northeast Corridor in the USA hinder the development of high-speed rail. Reverse curves cause buffer-locking. See also * S bridge *Road curve *Track geometry Track geometry is concerned with the properties and relations of points, lines, curves, and surfaces in the three-dimensional positioning of railroad track. The term is also applied to measurements used in design, construction and maintenance of t ... References Railway track layouts {{engineering-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lighter (barge)
A lighter is a type of flat-bottomed barge used to transfer goods and passengers to and from moored ships. Lighters were traditionally unpowered and were moved and steered using long oars called "sweeps" and the motive power of water currents. They were operated by skilled workers called lightermen and were a characteristic sight in London's docks until about the 1960s, when technological changes made this form of lightering largely redundant. Unpowered lighters continue to be moved by powered tugs, however, and lighters may also now themselves be powered. The term is also used in the Lighter Aboard Ship (LASH) system. The name itself is of uncertain origin, but is believed to possibly derive from an old Dutch or German word, ''lichten'' (to lighten or unload). In Dutch, the word ''lichter'' is still used for smaller ships that take over goods from larger ships. Lighters, albeit powered ones, were proposed to be used in 2007 at Port Lincoln and Whyalla in South Australia t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Swing Bridge
A swing bridge (or swing span bridge) is a movable bridge that has as its primary structural support a vertical locating pin and support ring, usually at or near to its center of gravity, about which the swing span (turning span) can then pivot horizontally as shown in the animated illustration to the right. Small swing bridges as found over canals may be pivoted only at one end, opening as would a gate, but require substantial underground structure to support the pivot. In its closed position, a swing bridge carrying a road or railway over a river or canal, for example, allows traffic to cross. When a water vessel needs to pass the bridge, road traffic is stopped (usually by traffic signals and barriers), and then motors rotate the bridge horizontally about its pivot point. The typical swing bridge will rotate approximately 90 degrees, or one-quarter turn; however, a bridge which intersects the navigation channel at an oblique angle may be built to rotate only 45 degrees, or ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Melville Whitney
Henry Melville Whitney (October 22, 1839 – January 25, 1923) was an American industrialist, the founder of the West End Street Railway Company of Boston, Massachusetts, and later the Dominion Coal Company Ltd. and the Dominion Iron and Steel Company Ltd. of Sydney, Nova Scotia. He was also president of the Metropolitan Steamship Company, long an important transportation link between Boston and New York City. Early life Henry Whitney was born on October 22, 1839 in Conway, Massachusetts to Brigadier General James Scollay Whitney (1811–1878) and Laurinda Collins. Henry's well known younger brother was the financier William Collins Whitney (1841–1904), who served as Secretary of the Navy in the first administration (1885–1889) of President Grover Cleveland. His sister Lucy Collins "Lily" Whitney married Charles T. Barney, who became the president of the Knickerbocker Trust Company. Another sister, Susan Collins Whitney, married Henry F. Dimock. Whitney was educated at W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dominion Steel And Coal Corporation
The Dominion Steel and Coal Corporation (also DOSCO) was a Canadian coal mining and steel manufacturing company. Incorporated in 1928 and operational by 1930, DOSCO was predated by the British Empire Steel Corporation (BESCO), which was a merger of the Dominion Coal Company, the Dominion Iron and Steel Company and the Nova Scotia Steel Company. DOSCO was one of the largest private employers in Canada during the 1930s-1950s. In 1957, DOSCO was purchased as a subsidiary of A.V. Roe Canada Ltd. In 1966 it terminated coal operations. This led in 1967 to the creation of a crown corporation, the Cape Breton Development Corporation, or DEVCO, which took over operations. Corporate predecessors Industrial Cape Breton consisted of two distinctive geographic regions for industrial activity: the "north side" of Sydney Harbour, and the "south side". The north side was dominated in the 1800s by the General Mining Association (GMA), which had been formed in the 1820s after the Colony of Cap ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Retractile Drawbridge
A retractile drawbridge is a rare type of moveable bridge in which the span is pulled away diagonally on rails. It is a variant of the retractable bridge A retractable bridge is a type of moveable bridge in which the deck can be rolled or slid backwards to open a gap while traffic crosses, usually a ship on a waterway. This type is sometimes referred to as a thrust bridge. Retractable bridges d .... Only four examples are known to exist in the United States. It is believed to have been invented by T. Willis Pratt in the 1860s. References {{Bridge-type-stub Bridges ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Grain Elevator
A grain elevator is a facility designed to stockpile or store grain. In the grain trade, the term "grain elevator" also describes a tower containing a bucket elevator or a pneumatic conveyor, which scoops up grain from a lower level and deposits it in a silo or other storage facility. In most cases, the term "grain elevator" also describes the entire elevator complex, including receiving and testing offices, weighbridges, and storage facilities. It may also mean organizations that operate or control several individual elevators, in different locations. In Australia, the term describes only the lifting mechanism. Before the advent of the grain elevator, grain was usually handled in bags rather than in bulk (large quantities of loose grain). Dart's Elevator was a major innovation. It was invented by Joseph Dart, a merchant, and Robert Dunbar, an engineer, in 1842 and 1843, in Buffalo, New York. Using the steam-powered flour mills of Oliver Evans as their model, they invente ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Boston And Maine Railroad
The Boston and Maine Railroad was a U.S. Class I railroad in northern New England. Originally chartered in 1835, it became part of what was the Pan Am Railways network in 1983 (most of which was purchased by CSX in 2022). At the end of 1970, B&M operated on of track, not including Springfield Terminal. That year it reported 2,744 million ton-miles of revenue freight and 92 million passenger-miles. History The Andover and Wilmington Railroad was incorporated March 15, 1833, to build a branch from the Boston and Lowell Railroad at Wilmington, Massachusetts, north to Andover, Massachusetts. The line opened to Andover on August 8, 1836. The name was changed to the Andover and Haverhill Railroad on April 18, 1837, reflecting plans to build further to Haverhill, Massachusetts (opened later that year), and yet further to Portland, Maine, with renaming to the Boston and Portland Railroad on April 3, 1839, opening to the New Hampshire state line in 1840. The Boston and Maine Ra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frog War
A frog war occurs when one private railway company attempts to cross the tracks of another, and this results in hostilities between the two railways. It is named after the frog, the piece of track that allows the two tracks to join or cross and is usually part of a level junction or railroad switch. A frog war usually begins with legal actions, such as filing lawsuits and appealing to civic transportation authorities. But often the situation escalates into physical actions, with companies pitting their workers against one another with construction projects and train movements intended to frustrate or challenge the opposing railway. Division of costs It is generally the case that the second railway to arrive at an intended crossing has to bear the cost of the special trackwork needed to cross the first. This includes the cost of any interlocking tower or signal box. The latter is not necessarily to the disadvantage of the second railway, since it can signal its trains through the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
East Somerville Station
East Somerville station is a light rail station on the Massachusetts Bay Transportation Authority (MBTA) Green Line located in southeastern Somerville, Massachusetts. The accessible station has a single island platform serving the two tracks of the Medford Branch. It opened on December 12, 2022, as part of the Green Line Extension (GLX), which added two northern branches to the Green Line, and is served by the E branch. The location was previously served by railroad stations. The Boston and Lowell Railroad (B&L) opened a station at Milk Row in the mid-19th century; it was replaced with Prospect Hill station in the 1880s. The station was served by the Boston and Maine Railroad, successor to the B&L, until 1927. Extensions to the Green Line were proposed throughout the 20th century, most with Washington Street as one of the intermediate stations. A separate station in the Brickbottom neighborhood was rejected in 2008 during planning. By 2011, the planned station at Washington ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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