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Defect Detector
A defect detector is a device used on railroads to detect axle and signal problems in passing trains. The detectors are normally integrated into the tracks and often include sensors to detect several different kinds of problems that could occur. Defect detectors were one of the inventions which enabled American railroads to eliminate the caboose at the rear of the train, as well as various station agents placed along active routes to detect unsafe conditions. The use of defect detectors has since spread overseas to other railroad systems. History Before the advent of automated detectors, on-board train crew and track-side workers used to visually inspect trains for defects, like " hotboxes" (overheating bearings) which would smoke or glow red. By the 1940s, automatic defect detectors included infrared sensors for hotboxes, wires outlining the clearance envelope to detect high and wide loads, and "brittle bars" – frangible bars mounted between the rails – to detect draggin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wildwood Subdivision
The Wildwood Subdivision is a railroad line owned by CSX Transportation in Florida. It runs along CSX's Main Line (Seaboard Air Line Railroad), S Line from Baldwin, Florida, Baldwin south to Zephyrhills, Florida, Zephyrhills via Ocala, Florida, Ocala and Wildwood, Florida, Wildwood for a total of 155.7 miles. The S Line is CSX's designation for the line that was the Seaboard Air Line Railroad main line from 1903 to 1967. Route description The Wildwood Subdivision begins at Baldwin Junction in Baldwin, Florida, Baldwin. The line connects with CSX's Jacksonville Terminal Subdivision and Callahan Subdivision at Baldwin Junction, along with the Florida Gulf and Atlantic Railroad. From Baldwin Junction, the Wildwood Subdivision heads south along CSX's S Line through Starke, Florida, Starke and Waldo, Florida, Waldo to Ocala, Florida, Ocala. It connects with CSX's Brooker Subdivision at Wannee Junction in Starke. In Ocala, the Wildwood Subdivision crosses the Florida Northern Railr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axle Counter
An axle counter is a system used in railway signalling to detect the clear or occupied status of a specified section of track. The system generally consists of a wheel sensor (one for each end of the section) and an evaluation unit for counting the axles of the train both into and out of the section. They are often used to replace a track circuit. Principles and operation An axle counter consists of a sensor, which detects the individual axles of a train by mechanical, electrical or even fibre optic method, and an evaluator which counts the axles passing into and out of a rail section. The evaluator may also convert the analogue signal of the axle sensor into a digital signal. However, in some cases there is a separate unit which performs this task. The system is set up by having an axle counter sensor installed at each end of a section. As each train axle passes the axle counter sensor at the start of the section, a counter increments. An axle counter sensor comprises two in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Axle Load
The axle load of a wheeled vehicle is the total weight bearing on the roadway for all wheels connected to a given axle. Axle load is an important design consideration in the engineering of roadways and railways, as both are designed to tolerate a maximum weight-per-axle (axle load); exceeding the maximum rated axle load will cause damage to the roadway or railway tracks. Railway use On railways, a given section of tracks is designed to support a maximum axle load. The maximum axle load is determined by train speeds, weight of rails, density of sleepers and fixtures, amount and standard of ballast, and strength of bridges and earthworks. Higher operating speeds can be achieved by reducing axle loads and increased load-carrying capacity. Operating above the specified load can cause catastrophic failure of track components. The diameter of the wheels also affects the maximum axle load of a Talgo RD wagon. United Kingdom The standard rail weight for British railways is now . Befo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Weigh In Motion
Weigh-in-motion or weighing-in-motion (WIM) devices are designed to capture and record the axle weights and gross vehicle weights as vehicles drive over a measurement site. Unlike static scales, WIM systems are capable of measuring vehicles traveling at a reduced or normal traffic speed and do not require the vehicle to come to a stop. This makes the weighing process more efficient, and, in the case of commercial vehicles, allows for trucks under the weight limit to bypass static scales or inspection. Introduction Weigh-in-motion is a technology that can be used for various private and public purposes (i.e. applications) related to the weights and axle loads of road and rail vehicles. WIM systems are installed on the road or rail track or on a vehicle and measure, store and provide data from the traffic flow and/or the specific vehicle. For WIM systems certain specific conditions apply. These conditions have an impact on the quality and reliability of the data measured by t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
International Heavy Haul Association
The International Heavy Haul Association is an association of Heavy Haul railways. Members Members as at October 2021 comprised: International Heavy Haul Association Australia References External links Official Site International trade associations International rail transport organizations Rail freight transport Railway associations {{Rail ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bogie Tracking Behaviour Monitor - TBOGI System
A bogie ( ) (or truck in North American English) comprises two or more wheelsets (two wheels on an axle), in a frame, attached under a vehicle by a pivot. Bogies take various forms in various modes of transport. A bogie may remain normally attached (as on many railroad cars and semi-trailers) or be quickly detachable (as for a dolly in a road train or in railway bogie exchange). It may include suspension components within it (as most rail and trucking bogies do), or be solid and in turn be suspended (as are most bogies of tracked vehicles). It may be mounted on a swivel, as traditionally on a railway carriage or locomotive, additionally jointed and sprung (as in the landing gear of an airliner), or held in place by other means (centreless bogies). Although ''bogie'' is the preferred spelling and first-listed variant in various dictionaries, bogey and bogy are also used. Railway A ''bogie'' in the UK, or a ''railroad truck'', ''wheel truck'', or simply ''truck'' in Nort ... [...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] |
Truck Scale
A truck scale (US), weighbridge (non-US) or railroad scale is a large set of scales, usually mounted permanently on a concrete foundation, that is used to weigh entire rail or road vehicles and their contents. By weighing the vehicle both empty and when loaded, the load carried by the vehicle can be calculated. The key component that uses a weighbridge in order to make the weigh measurement is load cells. Weight certification in the United States Commercial scales have to be National Type Evaluation Program (NTEP) approved or certified. The certification is issued by the National Conference on Weights and Measures (NCWM), in accordance to the National Institute of Standards and Technology (NIST), "Handbook 44" specifications and tolerances, through ''Conformity Assessment'' and the ''Verified Conformity Assessment Program'' (VCAP) Legal for trade Handbook 44: General Code paragraph G-A.1.; and the NIST Handbook 130 (Uniform Weights and Measures Law; Section 1.13.) def ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Double-stack Rail Transport
Double-stack rail transport is a form of intermodal freight transport in which railroad cars carry two layers of intermodal containers. Invented in the United States in 1984, it is now being used for nearly seventy percent of United States intermodal shipments. Using double stack technology, a freight train of a given length can carry roughly twice as many containers, sharply reducing transport costs per container. On United States railroads, special well cars are used for double-stack shipment to reduce the needed vertical clearance and to lower the center of gravity of a loaded car. In addition, the well car design reduces damage in transit and provides greater cargo security by cradling the lower containers so their doors cannot be opened. A succession of larger container sizes have been introduced to further increase shipping productivity in the United States. Double-stack rail operations are growing in other parts of the world, but are often constrained by Structure gauge, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
