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Rkarn: <br /> <br />Yes, each and every axle is scanned. The 2 transducers (magnets) that are near the scanners make the counts and helps with the scanning of each axle for any over-heated bearings. You can't see them in the picture posted, because they are inside of the gage of the track. Our rules are: check the bearing that alarmed and one bearing on either side, just in case a miscount happens. The model pictured is the Servo 8808. Harmon finally bought out Servo and we purchased the Cyberscan 2000 to replace our Servo 8808. The Cyberscan 2000 will store 196 trains into its memory, like a data recorder. It will tell you the date & time the train went over it, what direction it was traveling in, how fast it was going, what train it was for the day passing by (the 3rd, 4th, 5th, etc), average heat for each side, then, the heat detected for each and every axle. It measures the amount of heat over the outdoor ambient temperature. If an axle said 22º, that would mean it was [(22º) + (outdoor ambient temp)]. I've been working with these for 21 years now. We originally had the Servo 7707 which used vacuum tubes, including one inside of the actual sensor! We have these on average every 18 miles. The "A" and "B" transducers near the scanners have their internal magnets spaced 24 inches apart. As the wheel rolls thru taht 24 inches, that's when the heat samples are being collected. Harmon states 32 samples are taken during that 24 inches of travel. Imagine how fast that is happening when our high speed trains are rolling at 125mph over the hotbox detectors! The D.E.D. (dragging equipment detector) the lower photo does the job just as its name implies. If the train is dragging something, it will knock over those spring loaded paddles and drop the home signal at the interlocking the train is approaching. Usually, that's why those are installed, to protect interlockings. The reason is so that a train that may be dragging something, or, something is hanging down from the train, won't roll thru an interlocking and tear up the switches. The D.E.D. used to have these hollow letter "T"s that actually broke off when they were struck - makes for a bad day if you're near those! The "T'"s were part od a series circuit with +12VDC, and, if one broke, it would drop a relay. Even with the spring loaded draggers, like in the photo, we have to stand clear of them when a train passes by - those things can act like a big scraper that cn cause things to fly at you!
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