As I hope you can see in the video, the train brake is vacuum and controlled by the "banjo" on the left. As the banjo rotates it pushes out the piston in the middle of its face to co-activate the loco steam brake, but it is also linked by the metal bar to the ejector on the right of the picture.
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I have animated them as a complete unit, as can be seen, and I assume the same animation can be used for the train and loco brakes control values, but as the ejector works in the opposite direction (open when brakes are off, shut when brakes are in running or applied position) can I use the same animation or do I need a separate animation, or something like an Interior Multi-Ref Lever?