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Careful with the captions
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John Barry
While generally correct, sometimes you have to take the OWI captions on the LOC collection with a grain of salt. Case in point is the following:
While I believe that the date, and other info is correct, and the refinery may even produce AVGAS, I don't think that is the product flowing into this tank car. Last time I checked, AVGAS was a liquid and shipped in AAR class TM or TMI tanks with expansion domes. The liquid fuel did (and still does in future times like now) expand and contract with the ambient temperature. What I see in this photo though is some kind of transfer to or from a pressurized tank where the worked is manipulating the valves protected by a "bonnet". Note the small diameter of the "dome" and its flanged construction. Then there is the the hardware on the hoses connecting to the tank, the one has a round dial that looks like a pressure gauge, not something that you would see on a liquid transfer at atmospheric pressure. Hyperbole for the war effort aside, it's still a great shot of WWII railroading, as are the other photos in the collection. John Barry ATSF North Bay Lines Golden Gates & Fast Freights Lovettsville, VA 707-490-9696 PO Box 44736 Washington, DC 20026-4736
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Tony Thompson
John Barry wrote:
I agree with John. This is not an AvGas tank car, much more likely propane (before it was tagged as LPG). But it really is an excellent shot of the hoses used for loading or unloading ICC 105-type tank cars through the bonnet valving. In fact, I used this same John Vachon photo in a recent blog post explaining how tank cars like this are unloaded. Here's a link if you are interested: Tony Thompson Editor, Signature Press, Berkeley, CA 2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com (510) 540-6538; e-mail, tony@... Publishers of books on railroad history
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Jon Miller <atsfus@...>
On 9/17/2017 8:56 AM, Tony Thompson
tony@... [STMFC] wrote:
But it really is an excellent shot of the hoses used for loading or unloading ICC 105-type tank cars through the bonnet valving. So when empty the tank would still be under a
low pressure with vapor? -- Jon Miller For me time stopped in 1941 Digitrax Chief/Zephyr systems, JMRI User SPROG User NMRA Life member #2623 Member SFRH&MS
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Tony Thompson
Jon Miller wrote:
Yes. For many cargoes, admitting air was not a particularly good idea. Tony Thompson Editor, Signature Press, Berkeley, CA 2906 Forest Ave., Berkeley, CA 94705 www.signaturepress.com (510) 540-6538; e-mail, tony@... Publishers of books on railroad history
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