That is because Center-1 (Camaragibe) and Center-2 (Jaboatão) Lines share the part of the railway between Recife and Coqueiral stations, reusing the route of an old railway track, where the metro system was built.
Hal ini terjadi karena fakta bahwa Jalur Tengah-1 (Camaragibe) dan Tengah-2 (Jaboatão) berbagi jalur antara stasiun Recife dan Coqueiral, menggunakan rute dari jalur rel lama dimana sistem metro dibangun.