Re: tank car domes

Dave Parker

Ian's message contains several persistent misconceptions about the "2% rule" (which didn't apply to MCB Spec II cars built before May, 1917), the (in)adequacy of a 2% dome for volatile and inflammable products, and the notion that "most" Spec III cars were built with domes that just met the 2% minimum requirement (they weren't).  The provision of "extra" expansion capacity by not filling the cars to shell-full is not a modern practice at all, but also dates back to the teens.  We discussed this at length in August of 2019 starting with message 166255

Dave Parker
Swall Meadows, CA

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