→Busto Arsizio FS – Busto Arsizio FNM
 (''127C4'') IT19/01
Services started over this newly-constructed curve on 11 September 2011. It is used by
through trains every two hours between Como S Giovanni and Malpensa Aeroporto via Mendrisio and Varese. The junction with the main line is north of Busto Arsizio FS station.
===Como avoiding line: Cucciago (Bivio Rosales) – Chiasso===