Barcelona Metro line 4

Rapid transit line in Barcelona, Spain

Line 4, also known as Trinitat Nova – La Pau, usually called "línia groga", is a line in the Barcelona Metro network operated by TMB, and part of the ATM fare-integrated transport network. It serves the northern districts of the city, and it is being extended to the new major metro and rail stations Estació de la Sagrera and Sagrera-Meridiana.

This keyword could refer to multiple things. Here are some suggestions: