Since it started its activities in 1994, COMSA de Argentina has participated in numerous works for the diverse concessionaries that operate in the country. Ferrocarril Belgrano S.A., Ferrovías S.A.C., Metrovías S.A., Metropolitano (Tmr - Tms - Tmb), and Trenes de Buenos Aires S.A. are some of its clients. Below, you will find some of the works carried out by COMSA de Argentina. The works marked with a have further information available in PDF format. Renewal and improvement of the track at various sections on the Belgrano Railway in the north of Argentina, in the provinces of Catamarca, Formosa, Chaco, Santiago del Estero and Salta Entire renewal of the double track and 25 sidings. North Belgrano railway, Metropolitan Area of Buenos Aires. Section between Retiro and Boulogne stations. Operated under concession by Ferrovías S.A.C. Renovation and improvement of the wide gauge track. Belgrano Railway. Province of El Chaco and Santiago del Estero Track renewal.     North Belgrano Railway, Metropolitan Area of Buenos Aires. Section: D. Torcuato-Del Viso. Operated under concession by Ferrovías S.A.C. Improvement and renovation of the entire double track and cleaning up of the track formation. Urquiza Railway line, Metropolitan Area of Buenos Aires. Beiró, Libertador and Lourdes stations. Operated under concession by Metrovías S.A. Entire renewal of track and 15 sidings. J. Mármol station, Temperley-Bosques branch line. Roca Railway Line (TMR), Metropolitan Area of Buenos Aires Tamping, levelling and aligning the track. Mitre Railway line and Sarmiento Railway line, Metropolitan Area of Buenos Aires. Both lines operated under concession by Trenes de Buenos Aires Tamping, levelling and aligning 30 km of 1676 mm wide gauge track, between Jose. C. Paz and Pilar stations. San Martín Railway line (TMS). Metropolitan Area of Buenos Aires (Argentina). Line operated under concession by Metropolitan