Line 1, coloured red on system maps, is long, of which are underground (from Tajrish station to Shoush-Khayyam crossing) and the rest runs at surface level. There are 29 stations along this line of which 22 stations are located underground and 7 above ground. , the total capacity of line 1 is 650,000 passenger per day, with trains stopping at each station for 20 seconds. The trains are each made up of seven wagons, with a nominal capacity of 1,300 seated and standing passengers. The maximum speed of the trains is which is tempered to an average of due to stoppages at stations along the route.