Passenger equipment Diaphragms
I have seen a number of arrangments of diaphragm equipment and am trying to find out if there is any timeline or upgrade process. Those with a single steel leaf spring at top, those with the leaf...
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In my research, while building a large fleet of cars, I observed, that it held that the major builders had a style they used all the time. Don't know if this was due to patent considerations or not....
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