Apart from the wall facing Great Howard Street, the other 3 walls of the goods station (on the 1906 OS map) are shown as dotted lines.
I don't know what dotted lines indicate, but guess that, are far as stations were concerned there were no walls.
(The rear of Exchange where the trains entered is a dotted line).
The site of GHS is shaded, which (I think) indicates a roof.
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