Colouring the extension blue is an insane bit of graphic design. I've seen many other cities around the world open extensions to existing lines, and while the extension was under construction it's been portrayed either the same colour as the open line, but with dashed lines, or in a lighter shade of the same colour.
It's no surprise that there's confusion about the Broombridge extension, just like the old rumour that the red and green lines have different track gauge.
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