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Posted By neals645 on 09/29/2008 10:52 AM
I'm no engineer but it seems to me that the above would be true for a stationary train but not for one in motion.

For a train going up the grade the loco drivers will apply force to the rails pushing the rail down the grade with a force equal to the force of the driver pulling the train up the grade. On the downhill trip the brakes, if used, will transfer some of the train's momentum to the rail and therefore to the bridge.

Not sure whether these forces are significant enough to require the downhill support to be stronger.

Neal

Also true of a 0% grade with this change - a train going across the bridge will apply force to the rails pushing the rail across the supports with a force equal to the force of the driver pulling the train across the bridge but in the opposite diection.
 
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