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Chicago Loop Derailment
__NOTOC__ The 1977 Chicago Loop derailment occurred on February 4, 1977, when a Chicago Transit Authority elevated train rear-ended another on the northeast corner of the Loop at Wabash Avenue and Lake Street during the evening rush hour. The collision forced the first four cars of the rear train off the elevated tracks, killing 11 people and injuring at least 268 as the cars fell onto the street below. Infrastructure layout " The Loop" not only refers to Chicago's central business district, but also a rectangular pattern formed by the city's elevated trains. Some trains entering the Loop do a complete circuit around the entire rectangular "loop", and after turning around all four corners, leave on the same path they came from. Other routes enter the Loop, turning only two of the corners, and then leave on a different route. Further complicating this is the fact that some trains' routes follow a clockwise pattern around the Loop, but others go counter-clockwise. In 1977, w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Chicago
(''City in a Garden''); I Will , image_map = , map_caption = Interactive Map of Chicago , coordinates = , coordinates_footnotes = , subdivision_type = Country , subdivision_name = United States , subdivision_type1 = State , subdivision_type2 = Counties , subdivision_name1 = Illinois , subdivision_name2 = Cook and DuPage , established_title = Settled , established_date = , established_title2 = Incorporated (city) , established_date2 = , founder = Jean Baptiste Point du Sable , government_type = Mayor–council , governing_body = Chicago City Council , leader_title = Mayor , leader_name = Lori Lightfoot ( D) , leader_title1 = City Clerk , leader_name1 = Anna Valencia ( D) , unit_pref = Imperial , area_footnotes = , area_tot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Green Line (CTA)
The Green Line is a rapid transit line on the Chicago Transit Authority's "L" system. It is a completely elevated route in the "L" system; all other routes may have various combinations of elevated, subway, street level (at grade), or freeway median sections. The Green Line utilizes the system's oldest segments, dating back to 1892, extending with 30 stops between Oak Park/Forest Park (Harlem/Lake) and Chicago's West Side, to the Loop, and then to the South Side neighborhoods of West Englewood (Ashland/63rd) and Woodlawn (Cottage Grove/63rd). As of 2021, approximately 15,000 passengers board this line each weekday. Route Lake Street Elevated Beginning at the yard and inspection facilities in Forest Park, the Green Line runs east through Oak Park towards the city on an embankment adjacent to Metra's Union Pacific/West Line tracks from the Harlem Avenue terminal, on the border of Oak Park and Forest Park, to a point just west of Laramie Avenue. Here, the Green Line trac ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Inertia
Inertia is the idea that an object will continue its current motion until some force causes its speed or direction to change. The term is properly understood as shorthand for "the principle of inertia" as described by Newton in his first law of motion. After some other definitions, Newton states in his first law of motion: The word "perseveres" is a direct translation from Newton's Latin. Other, less forceful terms such as "to continue" or "to remain" are commonly found in modern textbooks. The modern use follows from some changes in Newton's original mechanics (as stated in the ''Principia'') made by Euler, d'Alembert, and other Cartesians. The term inertia comes from the Latin word ''iners'', meaning idle, sluggish. The term inertia may also refer to the resistance of any physical object to a change in its velocity. This includes changes to the object's speed or direction of motion. An aspect of this property is the tendency of objects to keep moving in a straight li ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tetrahydrocannabinol
Tetrahydrocannabinol (THC) is the principal psychoactive constituent of cannabis and one of at least 113 total cannabinoids identified on the plant. Although the chemical formula for THC (C21H30O2) describes multiple isomers, the term ''THC'' usually refers to the Delta-9-THC isomer with chemical name (−)-''trans''-Δ9-tetrahydrocannabinol. THC is a lipid found in cannabis and, like most pharmacologically active secondary metabolites of plants, it is assumed to be involved in the plant's evolutionary adaptation, putatively against insect predation, ultraviolet light, and environmental stress. THC was first discovered and isolated by Israeli chemist Raphael Mechoulam in Israel in 1964. It was found that, when smoked, THC is absorbed into the bloodstream and travels to the brain, attaching itself to endocannabinoid receptors located in the cerebral cortex, cerebellum, and basal ganglia. These are the parts of the brain responsible for thinking, memory, pleasure, coordination a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jackknifing
Jackknifing is the folding of an articulated vehicle so that it resembles the acute angle of a folding pocket knife. If a vehicle towing a trailer skids, the trailer can push the towing vehicle from behind until it spins the vehicle around and faces backwards. This may be caused by equipment failure, improper braking, or adverse road conditions such as an icy road surface. In extreme circumstances, a driver may attempt to jackknife the vehicle deliberately to halt it following brake failure. Trailer swing When a trailer skids to one side, this is known as a trailer swing or trailer slew. This can occur on a slippery road surface, often where there is a cant. This is not the same as jackknifing and is not as serious, as the trailer will move back into line as the vehicle continues forwards. The driver must be aware, however, that the trailer could slide up against parked cars or a guard rail, or that the wheels could slide into a ditch. This situation can occur especially when ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2000-series (CTA)
The 2000-series was a series of Chicago "L" car built in 1964 by Pullman-Standard of Chicago, Illinois. 180 cars were built. The 2000-series was the first of five series of Chicago "L" cars known as the High-Performance Family. Delivered to the CTA in 1964, they were built as married-pair sets, like the PCC-based 6000-series cars before them. The 2000-series, along with the High-Performance Family in general, were meant as both as a supplement for the 6000-series cars (which were built from discontinued PCC streetcar components) and a replacement for the aging 4000-series cars dating from the early 20th century. The CTA also needed a train car that would meet more modern demands for train service, such as higher speeds and more comfortable interiors. The 2000-series' more modern control systems initially prevented them from being used in a train with other system types, until the delivery of the 2200-series and later cars in the High-Performance Family. These cars were the base ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2200-series (CTA)
The 2200-series was a series of Chicago "L" cars built in 1969 and 1970 by the Budd Company of Philadelphia, Pennsylvania. 150 cars were built. The last 8 2200-series cars were retired from service after their ceremonial last trips on the Blue Line on August 8, 2013. These cars were in service for 44 years. All cars except the preserved ones were scrapped by October 2015. The 2200-series was the second of five series of Chicago "L" cars known as the High Performance Family. These cars were used for the Lake/Dan Ryan, Howard/Englewood and West-Northwest routes, From 1993 to 2013, these cars were used on the Blue Line with the 2600-series cars. From 2006 to 2008, these cars were used on the Pink Line with the 2600-series cars. History In 1967, the City of Chicago began construction on two rapid transit projects, both in the median of two expressways, the Dan Ryan and the Kennedy. These two projects needed an order of new rail cars to supplement the existing fleet, and th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railway Coupling
A coupling (or a coupler) is a mechanism typically placed at each end of a railway vehicle that connects them together to form a train. A variety of coupler types have been developed over the course of railway history. Key issues in their design include strength, reliability, ease of making connections and operator safety. The equipment that connects the couplings to the vehicles is the draft gear or draw gear and these must absorb the stresses of coupling and train acceleration. Nomenclature Compatible and similar couplings or couplers are frequently referred to using widely differing make, brand, or regional names, or nicknames, which can make describing standard or typical designs confusing. Dimensions and ratings noted in these articles are usually of nominal or typical components and systems, though standards and practices also vary widely with railway, region, and era. Buffers and chain The basic type of coupling on railways following the British tradition is the bu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Motorman (rail Transportation)
A motorman is a person who operates a tram (streetcar), light rail, or rapid transit train. A motorman is in charge of operating their train, applying power to traction motors, in the same sense as a railroad engineer is in charge of the engine. The term was and, where still used, is gender-neutral. Though motormen have historically been men, women in the position (first appearing in the United States during the World Wars) were usually also called motormen as a job title. Twin City Lines adopted the diminutive "motorette" for their women employees. The term has been replaced by more neutral ones, as gender-specific job titles have fallen into disuse. On systems such as the New York City Subway and London Underground, the position is now called "train operator" (T/O). After transitioning to one-person operation on the Chicago "L", use of "operator" came as a replacement term after motormen assumed the additional responsibilities previously of the conductor's. The operator of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Union Loop
The Loop (historically Union Loop) is the long circuit of elevated rail that forms the hub of the Chicago "L" system in the United States. As of 2012, the branch has served 74,651 passengers every weekday. The Loop is so named because the elevated tracks loop around a rectangle formed by Lake Street (north side), Wabash Avenue (east), Van Buren Street (south), and Wells Street (west). The railway loop has given its name to Chicago's downtown, which is also known as the Loop. Transit began to appear in Chicago in the latter half of the 19th century as the city grew rapidly, and rapid transit started to be built in the late 1880s. When the first rapid transit lines opened in the 1890s, they were independently owned and each had terminals that were located immediately outside of Chicago's downtown, where it was considered too expensive and politically inexpedient to build rapid transit. Charles Tyson Yerkes aggregated the competing rapid transit lines and built a loop connecting th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Randolph/Wabash Station
Randolph/Wabash was an elevated 'L' station in the Loop in Chicago. Located at Randolph Street and Wabash Avenue, it served trains running on the Chicago Transit Authority's Brown and Green Lines on the outer loop track, and the Green, Orange, Pink, and Purple Lines on the inner loop track. Randolph/Wabash was the closest 'L' station to Metra's Millennium Station until its closure on September 3, 2017. The station was later demolished. History Randolph/Wabash opened on November 8, 1896, to be used by trains on the Lake Street Elevated Railroad (now the western section of the Green Line).Randolph/Wabash.' Chicago-"L".org (URL accessed September 30, 2006). The original inner loop station house was replaced in 1957, and the outer loop station house was removed in the 1960s. On September 3, 2017, Randolph/Wabash closed, three days after its replacement, Washington/Wabash station, opened. In popular culture Randolph/Wabash was used for exterior shots in the 1995 film '' While You We ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cab Signaling
Cab signaling is a railway safety system that communicates track status and condition information to the cab, crew compartment or driver's compartment of a locomotive, railcar or multiple unit. The information is continually updated giving an easy to read display to the train driver or engine driver. The simplest systems display the trackside signal, while more sophisticated systems also display allowable speed, location of nearby trains, and dynamic information about the track ahead. Cab signals can also be part of a more comprehensive train protection system that can automatically apply the brakes stopping the train if the operator does not respond appropriately to a dangerous condition. Overview The main purpose of a signal system is to enforce a safe separation between trains and to stop or slow trains in advance of a restrictive situation. The cab signal system is an improvement over the wayside signal system, where visual signals beside or above the right-of-way gov ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
