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The eastern part is already completed, while the west is 72.5% done. For this section, larger TBMs are being used, measuring 9.15 metres across, so that passengers can disembark directly inside the tunnels, reducing the space occupied by the stations to a minimum. In January, excavations began on the central section of the route, which includes eight stops (Tricolore, San Babila, Sforza Policlinico, Santa Sofia, Vetra, De Amicis, Sant’Ambrogio, Parco Solari). These are just a few of the things that stand out in what is being called “the neighbourhood’s metro,” a project that aims to let local people have their say not only from the moment it opens its doors, but also while it was being built. This led to certain decisions being taken to minimise the impact of the construction works on nearby residents, such as disposing the earth excavated in the tunnels by using underground conveyor belts instead of trucks or working with the superintendent’s office to display the archaeological finds unearthed during the excavation at the Archaeological Museum of Milan. So anyone could have their say about the M4 project, giving feedback, presenting a proposal or raising criticism or concern, be it from a neighborhood committee, a business owner or an individual resident. In 2018 alone, 10,000 people took part in the “open days” organised to let the curious visit the new stations. The M4, funded by a public-private partnership with construction led by a consortium headed by Salini Impregilo, was designed from the very start to encourage residents to be involved.
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