In 2011, Line 1 accounted for 39.5% of all trips made on the Santiago Metro, which makes it the most used line of the system.

Also of note, Turnstiles are being added to all existing (and future) lines of the system.

BFE in contrast often appears to be a late 'bolt on' that interrupts the smooth lines and operations of the original system.

The second line of the system, the "I-44/Shrewsbury" Line entered service in 2006.

Line 8 is the newest line of the system, always running with modern stock.

Some spectroscopic binaries cannot be visually resolved and are discovered by studying the spectral lines of the suspect system over a long period of time.

There is a third variation (Class A) which requires riders to cover all lines of the system.

The first line of the system was opened on 1 December 2011, after more than 23 years of construction.

The Austrian army had undergone an overhaul along the lines of the Prussian system.

Today there are 22 stations on the line, with the latter being 45.1 kilometres long and having the status of the longest line of the system.