Amsterdam Central Station is the central railway station of Amsterdam and one of the most impressive buildings of the capital. It is used by 166,000 passengers a day. The station building of Amsterdam Centraal was designed by Pierre Cuypers and A. L. van Gendt, and opened in 1889. It features a roof span of approximately 40 metres fabricated in cast iron by Andrew Handyside of Derby, England. The building of Amsterdam Centraal is situated on three man-made islands, themselves resting on 8,687 wooden piles which have been driven deep into the muddy and sandy soil. The station is currently under reconstruction due to the construction of the North/South metro line.