Bolad Valad work includes: Supplying materials and equipment and full construction of side ramp of guard structure, main structure, finishing, electrical and mechanical installations of R6 station of Tehran Subway. This is the only Station of Rout 6 of Tehran’s subway which is done by N.A.T.M method. This station is 140 meters long and 38 meters under the ground and has two entrances. In order to construct this station, ramps and tunnels with the length of 230 meters have been implemented with supporting structures. Major employer: Tehran Urban and Suburban Railway Operation Company