Re: covered hopper pneumatic discharge
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Ahem. I'll offer a gentle reminder that airslides all use pneumatic outlets,
and they began to appear in 1954. Even gravity-pneumatic outlets were offered
by 1960, if not earlier. The 1961 CBC has ACF, GATC and other photos and
illustrations of pneumatic outlets.
I think for the most part pneumatic discharge gates postdate the 1960 cut-off of this list. You might have better luck on the Baby Boomer Freightcar List: