Initially, the system operated trains from 01:00 to 05:00 only on Thursdays through Saturdays, but, starting on 19 March 2009, night service was extended to the rest of the week.
Pada awalnya, sistem mengoperasikan kereta antara pukul 01:00 hingga 05:00 pada hari Selasa hingga Sabtu, namun mulai 19 Maret 2009, layanan malam diperpanjang hingga sepanjang minggu.