1. It was a device called a hinge derailer . 2. A " derailer " works by derailing any vehicle passing over it. 3. How common are these derailer thing anyway? 4. Plans are made to purposely derail the train outside the town of Arklow using a portable derailer . 5. The derailer on my right handlebar shifted into seven; the one on my left shifted into three. 6. This has the added benefit of preventing damage to the infrastructure and traction and rolling stock that a derailer system causes. 7. There are different types of derailer , but in some cases they consist of a single switch point installed in a track. 8. As it continued, an automatic derailer at the end of the pocket track intentionally derailed the train as a safety measure. 9. It does not use a bungee cord to maintain tension, instead it has a circular chain case mounted where the derailer normally hangs. 10. There was just one trick : to downshift, I had to turn the right derailer toward me, and the left derailer away from me.
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