In recent years, COMSA de Chile has consolidated its position in the railway construction sector in Chile, with a portfolio of clients which includes the State railway company (EFE). In addition, it has broken into new markets linked to the concessions activity. Below, you will find some of the works carried out by COMSA de Chile. The works marked with a have further information available in PDF format. Track renewal on the Central Line. Chillán-Temuco and Temuco-Mariquina sectors Project for the railway transporting of solid waste from Quilicura, Santiago, to the tips in Loma de los Colorados in Montenegro Renewal and maintenance on the track in the north area, section between Santiago-Sant Antonio and Santiago-Valparaíso Project for the transporting by rail of solid waste from Quilicura, Santiago, to the tips in Loma de los Colorados in Montenegro Track renewal on the Central Line. Chillán-Temuco and Temuco-Mariquina sectors Renewal of the track in Chimbarongo, Chillán, Temuco, Guardacruces, Quilicura and Montenegro Renewal Alameda-Rancagua Maintenance of the EFE track, Central South Line, Chimbarongo-Chillán sector Maintenance of the EFE track, Talca-Constitución branch line Operation and Maintenance of the EFE Railway level crossings. San Rosendo branch line, Hualqui-Talcahuano sector Track Rehabilitation of the EFE track, South Central line, Chillán-Temuco sector Construction of the infrastructure of the FEPASA Railway Transport Project for solid waste from KDM-URBASER Construction of the relief track for the EFE and repositioning of Quillota Station Track Rehabilitation of the EFE track, South Central line, Chimbarongo-Linares sector Track Rehabilitation of the EFE track, South Central line, Linares-Chillán sector Maintenance of the EFE track, Alameda-Chillán sector and the Talca-Constitución branch line Maintenance of the EFE track, Alameda-Chillán sector and branch lines