-- Line 4 , also known as Trinitat Nova -- La Pau , usually called `` línia groga '' ( yellow line ) , is a line in the Barcelona Metro network operated by TMB , and part of the ATM fare-integrated transport network .
Line 4 , currently known as Trinitat Nova -- La Pau , usually called `` línia groga '' ( yellow line ) , is a line in the Barcelona Metro network operated by TMB .