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The draw bar is the semi permanent coupler between the cars which form a fixed unit. This image also shows the electrical cables between the cars, and the 'over riders' on the solebar ends - the 'over riders' prevent the adjacent car from riding over it's neighbour in a collision situation ('over riders' are D stock only, C stocks have spring loaded central 'buffers').
Note also the additional pipe on the side of the draw bar - there are two air lines between the cars, this pipe is one air line whilst the other is inside the draw bar itself.
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