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| Re: How Railroad Could Have Avoided / Ameliorated Fiery Crash (1338636) | |||
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Re: How Railroad Could Have Avoided / Ameliorated Fiery Crash |
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Posted by ElectricTraction on Sat Feb 7 21:11:50 2015, in response to Re: How Railroad Could Have Avoided / Ameliorated Fiery Crash, posted by Broadway Lion on Sat Feb 7 14:32:28 2015. F= mu*NIf your rail and wheels are the same, so you have the same mu, a heavier rail car is going to mean a bigger N, and thus a bigger F, linearly proportional to the addition kinetic energy the car has via KE= .5*m*v^2 , so the weight of the vehicle doesn't matter. Of course with higher speeds, KE shoots up due to the v^2 term. I'm not arguing that trains should have insane braking capabilities, or considering what else might get screwed up by a train braking that quickly, but physics are physics, and if an LRV can do it, an MN MU could be designed to do it. |
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