Because you never know when they'll come in handy.
http://youtu.be/8M1o2rpO_JY
every diesel owner should know what runaway is and what to do, either choke the intake or (if manual) put it in its highest gear and dump the clutch to kill it. i run a engine dyno for cummins and we have a few engines that have bad turbo's and they will run away, only way to kill it is our e-stop that basically just locks the dyno, its crazy seeing a 12 liter engine go from ~3000 rpm to zero in less then a second, and stuff usually breaks
Just a couple of years ago, we had a pair of fire engines that still had unsynchronized manual transmissions. Every morning, I'd make sure that the guy on the back knew that if the driver missed a shift and got the engine running backward, his job was to jump out and throw his coat into the exhaust pipe.
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