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| Re: Debris falls from #7 train, again, and again (1514901) | |||
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Re: Debris falls from #7 train, again, and again |
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Posted by Fisk Ave Jim on Wed Jun 5 13:51:28 2019, in response to Re: Debris falls from #7 train, again, and again, posted by Mitch45 on Wed Jun 5 13:30:34 2019. Just to last as long as it did is a testament to how things were (over) built back then. When you stop and think on how construction is done nowadays, back then building box girder elevated lines, which are essentially a series of bridges, all calculations & measurements with allowances for stress & seasonal expantion/contraction were figured out by men gifted with mathematical skills along with the worlds first analog computer...the slide rule. Truly amazing.Let us not forget #2 lead pencils & legal pads! |
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