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Abstract: The Interurban Train Line Toluca – Mexico crosses the mountain range of Las Cruces, which is part of the vast TransMexican Volcanic Belt, from east to west, with twin 4.7 km long tunnels, at depths from 15 to 136 m and with a slope of 4% in most of the alignment. Two 8.56 m. diameter EPB shields were used to bore the twin tunnels, facing the extremely complicated geology of the region composed...