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We call them glad hands here. But it looks like the same thing as palm couplings.
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Also fun fact while I think of it, iirc Edison had a business partner called Westinghouse and it was him who I believe designed the first air brakes for locomotives
It worked so well, they were adopted into road freight worldwide
So when you see wabco, which is a very common trademark, it stands for westinghouse anti braking system
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Are the joining mechanisms 'palm couplings' you have there?
These are found mostly in mainland Europe, in the UK they use the straight line couplings with a twist to prevent release