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Incidentally Argyle Street station on the Glasgow suburban network is
underground, with escalators going down from the ticket hall (which is
just off Argyle Street) to a concourse, then escalators *up* to the
platform. The reason for this is because the tunnel is immediately
below the centre of Argyle Street itself without space for a concourse
between street and platforms.

True. The escalators at Argyle Street station are also *very long*, like the
ones at Euston or Angel.