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Some pictures taken on the first day of entry into service of the first 4000 series formation reformed for line 1. The 4000 series arrived in 1988 to replace the old series of line 1, which stands out for being wide gauge and not international like the rest and therefore, for having a wider rolling stock (greater gauge). The 4000 series has entered a process of aesthetic and interior reform, rejuvenating itself in the image and likeness of the last series incorporated to the FCMB, in the case of L1, the 6000 series of CAF.