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In page Parliament railway station:

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The booking hall to the south was constructed 'upside down', with the support columns dug with augers from ground level, then filled with concrete. The roof was then constructed over these piles from ground level during a series of staged road closures, and once this was completed the excavation of the booking hall could be carried out underneath, while road traffic continued overhead. During construction the Parliament House fence had to be removed, stored then re-erected.[1]