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Cracks in Sherman Minton Bridge 1
- Thread starter swall
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bridgebuster
Active member
woodman88,
I found this on Wikipedia
"During the 1880s, railway bridges were built using an equivalent rating of E20. By 1894, when Cooper presented his standard, he recommended a standard of E40, or four times the E10 standard. By 1914, the standard had increased to E60. By the mid 1990s, the American Railway Engineering Association was recommending E72 (7.2 times the E10 standard) for concrete structures, and E80 for steel structures."
Later, I'll take a look at the NYC Transit specs to see if anything has changed. My guess is that the car loads are about the same now as they were a century ago.
I found this on Wikipedia
"During the 1880s, railway bridges were built using an equivalent rating of E20. By 1894, when Cooper presented his standard, he recommended a standard of E40, or four times the E10 standard. By 1914, the standard had increased to E60. By the mid 1990s, the American Railway Engineering Association was recommending E72 (7.2 times the E10 standard) for concrete structures, and E80 for steel structures."
Later, I'll take a look at the NYC Transit specs to see if anything has changed. My guess is that the car loads are about the same now as they were a century ago.
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