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Structure Gauging Car
A clearance car is a type of railroad car in maintenance of way service. Its purpose is to check the clearances around the tracks and ensure that trains conforming to the railroad's standard loading gauge or '' dynamic envelope'' will not encounter any obstruction. Additionally, by measuring the actual clearances along a route, the railroad can determine whether outsize loads can be accommodated along that route, and the largest size feasible. Design Early clearance cars simply consisted of an outline of the system loading gauge attached to a railroad car, which would be towed along the route to ensure the clearances were still sufficient. Later clearance cars functioned by using physical feelers—rods which extended from the car in all directions which would be deflected back by obstructions. These would be connected to instrumentation which displayed the actual clearance at that point. These feelers have an advantage in that they bounce back and do not break if the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
WMATA Rohr 1028 With Locomotive
The Washington Metropolitan Area Transit Authority (WMATA ), commonly referred to as Metro, is a tri-jurisdictional public transit agency that operates transit services in the Washington metropolitan area. WMATA provides rapid transit service under the Metrorail name, fixed-route bus service under the Metrobus brand, and paratransit service under the MetroAccess brand. In , the system had a ridership of , or about per weekday as of . The agency participates in regional transportation planning and the execution of transit infrastructure projects. Recent projects include an infill station serving Potomac Yard and an extension of Metrorail to Dulles International Airport. WMATA was created in the late 1960s by the United States Congress as an interstate compact between Washington, D.C., Maryland, and Virginia. The authority's board of directors consists of two voting representatives each from the District of Columbia, Maryland, Virginia, and the U.S. federal government. Each ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Railroad Car
A railroad car, railcar (American English, American and Canadian English), railway wagon, railway carriage, railway truck, railwagon, railcarriage or railtruck (British English and International Union of Railways, UIC), also called a train car, train wagon, train carriage or train truck, is a vehicle used for the carrying of cargo or passengers on a rail transport network (a railroad/railway). Such cars, when coupled together and hauled by one or more locomotives, form a train. Alternatively, some Passenger railroad car, passenger cars are self-propelled in which case they may be either single railcars or make up multiple units. The term "car" is commonly used by itself in American English when a rail context is implicit. Indian English sometimes uses "bogie" in the same manner, though the term has Bogie, other meanings in other variants of English. In American English, "railcar" is a generic term for a railway vehicle; in other countries "railcar" refers specifically to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Maintenance Of Way
Maintenance of way (commonly abbreviated to MOW, also known as "Permanent Way Maintenance" or "PWM" in Britain) refers to the maintenance, construction, and improvement of rail infrastructure, including tracks, ballast, grade, and lineside infrastructure such as signals and signs. Track Railroad tracks consist of multiple key components: a track bed, and ballast forming the foundation of the tracks. Then the tracks themselves are place on the ballast, the tracks consist of a railroad tie, fasteners to secure the rails to the ties, such as spikes or clips, rails, which are assembled on a bed of ballast, which is in turn on a track bed that supports it all. Ballast is a material used to support the ties and rails, and keep them in place. It is also a key part of drainage along railway lines to ensure the integrity of the tracks during rain and other wet weather. Ballast is often a crushed stone. Stones need to be irregularly shaped, in order to increase friction that holds th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Engineering Tolerance
Engineering tolerance is the permissible limit or limits of variation in: # a physical dimension; # a measured value or physical property of a material, manufactured object, system, or service; # other measured values (such as temperature, humidity, etc.); # in engineering and safety, a physical distance or space (tolerance), as in a truck (lorry), train or boat under a bridge as well as a train in a tunnel (see structure gauge and loading gauge); # in mechanical engineering, the space between a bolt and a nut or a hole, etc. Dimensions, properties, or conditions may have some variation without significantly affecting functioning of systems, machines, structures, etc. A variation beyond the tolerance (for example, a temperature that is too hot or too cold) is said to be noncompliant, rejected, or exceeding the tolerance. Considerations when setting tolerances A primary concern is to determine how wide the tolerances may be without affecting other factors or the outcome of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Rail Tracks
Railway track ( and UIC terminology) or railroad track (), also known as permanent way () or "P way" ( and Indian English), is the structure on a railway or railroad consisting of the rails, fasteners, sleepers ( railroad ties in American English) and ballast (or slab track), plus the underlying subgrade. It enables trains to move by providing a dependable, low-friction surface on which steel wheels can roll. Early tracks were constructed with wooden or cast-iron rails, and wooden or stone sleepers. Since the 1870s, rails have almost universally been made from steel. Historical development The first railway in Britain was the Wollaton wagonway, built in 1603 between Wollaton and Strelley in Nottinghamshire. It used wooden rails and was the first of about 50 wooden-railed tramways built over the subsequent 164 years. These early wooden tramways typically used rails of oak or beech, attached to wooden sleepers with iron or wooden nails. Gravel or small stones were pa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loading Gauge
A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. Their purpose is to ensure that rail vehicles can pass safely through tunnels and under bridges, and keep clear of platforms, trackside buildings and structures. Classification systems vary between different countries, and loading gauges may vary across a network, even if the track gauge is uniform. The term loading gauge can also be applied to the maximum size of road vehicles in relation to tunnels, overpasses and bridges, and doors into automobile repair shops, bus garages, filling stations, residential garages, multi-storey car parks and warehouses. A related but separate gauge is the structure gauge, which sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. The difference between these two gauges is called the clearance. The specified amount of clearance makes allowance for ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Envelope
A loading gauge is a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. Their purpose is to ensure that rail vehicles can pass safely through tunnels and under bridges, and keep clear of platforms, trackside buildings and structures. Classification systems vary between different countries, and loading gauges may vary across a network, even if the track gauge is uniform. The term loading gauge can also be applied to the maximum size of road vehicles in relation to tunnels, overpasses and bridges, and doors into automobile repair shops, bus garages, filling stations, residential garages, multi-storey car parks and warehouses. A related but separate gauge is the structure gauge, which sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. The difference between these two gauges is called the clearance. The specified amount of clearance makes allowance for wobbli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loading Gauge Profile Vehicle For South Australian Railways 500 Class Locomotives, 1926 (NRM 17-336-mb-b21-d15)
Loading may refer to: Biology * Carbohydrate loading, a strategy employed by endurance athletes to maximize the storage of glycogen in the muscles * Creatine loading, a phase of use of creatine supplements * Vocal loading, the stress inflicted on the speech organs when speaking for long periods Engineering * Application of a structural load to a system ** Disk loading, the pressure maintained over the swept area of a helicopter's rotor ** Seismic loading, one of the basic concepts of earthquake engineering ** Wing loading, the loaded weight of an aircraft divided by the area of its wing * Loading characteristic, a measure of traffic on a telephone system * Insertion of an electrical load into a circuit ** Use of a loading coil to increase inductance * Loading (computing), the process in which the contents of a file are read into a computer's memory Other uses * Task loading, the number of tasks taken on by a diver * Loading (TV channel), a Brazilian TV Network focused on pop and g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Laser
A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word ''laser'' originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow and the optical amplifier patented by Gordon Gould. A laser differs from other sources of light in that it emits light that is coherence (physics), ''coherent''. Spatial coherence allows a laser to be focused to a tight spot, enabling uses such as optical communication, laser cutting, and Photolithography#Light sources, lithography. It also allows a laser beam to stay narrow over great distances (collimated light, collimation), used in laser pointers, lidar, and free-space optical communication. Lasers can also have high temporal coherence, which permits them to emit light ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
York Station
York railway station is a principal stop on the East Coast Main Line (ECML) serving the cathedral city of York, North Yorkshire, England. It is north of and, on the main line, it is situated between to the south and to the north. , the station is operated by London North Eastern Railway (LNER). It is the busiest station in North Yorkshire, the third busiest in Yorkshire & the Humber and the sixth busiest in Northern England, as well as being the busiest intermediate station on the East Coast Main Line. In ''Britain's 100 Best Railway Stations'' by Simon Jenkins, the station was one of only ten to be awarded five stars. The present York station was built during the 1870s after it had become clear that the old station, which could not facilitate through traffic due to its positioning, was a hindrance to long distance express services along what is now referred to as the ECML. Designed by the North Eastern Railway architects Thomas Prosser and William Peachey and built by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Structure Gauge
A structure gauge, also called the minimum structure outline, is a diagram or physical structure that sets limits to the extent that bridges, tunnels and other infrastructure can encroach on rail vehicles. It specifies the height and width of station platforms, tunnels and bridges, and the width of the doors that allow access to a warehouse from a rail siding. Specifications may include the minimum distance from rail vehicles to railway platforms, buildings, lineside electrical equipment cabinets, signalling equipment, third rails or supports for overhead lines. A related but separate gauge is the loading gauge: a diagram or physical structure that defines the maximum height and width dimensions in railway vehicles and their loads. The difference between these two gauges is called the clearance. The specified amount of clearance makes allowance for wobbling of rail vehicles at speed or the shifting of vehicles on curves; consequently, in some circumstances a train may ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
