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Standard North American installation of a combination hot box / dragging equipment 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.
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The original plan of Dr. Sperry was to build and sell the rail detector cars, along with the testing services, to the railways. However, the railways were reluctant, so Sperry decided to sell the rail inspection service only. [2] It would lead to more consistent testing, which is done by skilled and experienced personnel.
This would eventually lead to the axle fracturing and the car above falling onto the wheel, or failure of the taper journal, causing the side frame and journal box to fall below the level of the rails, either of which could cause a major derailment of the train. Train worker duties consisted partly of inspecting the train as it ran by, looking ...
Cart from 16th century, found in Transylvania A dumper minecart used in the Basque Country, currently at the Minery Museum.. A minecart, mine cart, or mine car (or more rarely mine trolley or mine hutch) is a type of rolling stock found on a mine railway, used for transporting ore and materials procured in the process of traditional mining.
An axle counter detection point in the UK Axle counter for automatic railway crossing (Slovenia). An axle counter is a system used in railway signalling to detect the clear or occupied status of a specified section of track.
In 1907 Frank Wyatt Prentice patented a radio signalling system using a continuous cable laid between the rails energized by a spark generator to relay "Hertzian Waves" to the locomotive. When the electrical waves were active they caused metal filings in a coherer on the locomotive to clump together and allow a current from a battery to pass.
Magnetic induction was the method used on the first rail inspection cars. This was done by passing large amounts of the magnetic field through the rail and detecting flux leakage with search coils. Since then, many other inspection cars have traversed the rails in search of flaws.