platform. Car park Between 2011 and 2012, a new multi-storey car park was constructed between platform 6 and Queen's Road, over the western half of the station's existing car park. It was built by Vinci Construction beginning in March 2011 and officially opened on 14 May 2012. The initial car park design had been put on hold in 2008, after being described as a "chicken coop". The final design for the car park has 2,107 coloured metal sheets on the outside, formed of 2.1-millimetre-thick copper and stainless steel (1.5 mm stainless, 0.6 mm "Luvata" Copper). These panels are affixed to the car park using 8,000 cleats fixed to pre-cast channels in the concrete structure. The new car park building has five storeys and space for 950 cars. Remodelling Schemes costing £19 million (in 2007) and then £14 million (in 2008) were proposed. Remodelling and re-signalling costing £11.6 million were approved on 15 May 2009 by the Network Rail Investment Board and took place as part of Control Period 4 (CP4), between 1 April 2009 and 31 March 2014. Nottingham station was partially closed for ten weeks during 2013 for the track and signalling work. During the blockade, the western end of the station was closed to trains for 37 days and the eastern end for 10 days. Platform 4 was split to create two platforms. All four tracks at the western end were given bi-directional railway signalling, allowing a better choice of non-conflicting routes. These lines are referred to as Line A, Line B, Line C and Line D. Although all lines are bi-directional, their use is segregated, with services towards Sheffield and Mansfield focused on the northern pair of tracks, and services to Derby and Leicester focused on the southern pair of tracks. Line speeds for trains arriving from Chesterfield and the Robin Hood Line were increased from to . On 7 March 2012, Network Rail requested formal "network change" acceptance from the train operating companies. On-site preparation works began in September 2011, with all new signal structures installed by June 2013 followed by the "Nottingham blockade"; this itself lasted from July 2013 until the handover in September 2013. The work was spread from Beeston, past Mansfield Junction, Nottingham West Junction and to Nottingham East Junction. The blockade covered renewing of track and adding or renewing 14 sets of pointwork. Footbridge Halfway along the platforms is an overhead footbridge,