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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.
A hot box is the term used when an axle bearing overheats on a piece of railway rolling stock. [1] The term is derived from the journal-bearing trucks used before the mid-20th century. The axle bearings were housed in a box that used oil-soaked rags or cotton (collectively called "packing") to reduce the friction of the axle against the truck ...
A hot bearing detector w/ dragging equipment unit. There are several levels of inspection on railroad equipment. Inspections are continuous, starting when the car is being built and repeated at regular intervals. Before the train begins its journey, the locomotives and the cars are checked.
Hot box detectors have been around for decades, said Tarawneh, which makes them somewhat outdated. If railroads are waiting for increasing temperatures to sound the alarm, then they're likely ...
Industry research has shown that having hot box detectors every 15 miles is ideal, but investigators think more study is needed. After East Palestine, the six biggest railroads promised to install hot box detectors an average of 15 miles apart and adopted a uniform standard that trains should be stopped anytime a bearing registers more than 170 ...
The Seaboard Air Line would also be the first railroad to install a talking hot box detector (the predecessor to the modern defect detector). This first talking hot box detector was installed on the main line in Riceboro, Georgia. [6] In 1967, the Seaboard Air Line merged with their long-time rival, the Atlantic Coast Line Railroad (ACL).
Wheeltappers also check that the axle boxes are not too hot by using the back of their hand. [ 1 ] [ 2 ] Although wheeltappers still operate in some eastern European countries, in countries with modern planned maintenance procedures and line-side defect detectors , such as hot box detectors, wheeltappers are redundant.
Norfolk Southern has hired around 1,600 new employees over two years, including many conductors and engineers. The company has begun installing additional hot-box detectors, which can detect the kind of malfunction that led to the accident, including detectors on each side of East Palestine.
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