The line was constructed in 1899 and opened the following year.

This line was constructed away from the other two lines and is often out of sight.

The following list of stations may be subject to change as the line is constructed.

The line was constructed in two sections, north and south.

The line was constructed in 1903, as part of the original expansion plan.

Several lines were extended or constructed, with mostly poor quality results.

To this effect, several defensive lines had been constructed throughout the country.

The original line was constructed in 1891 but closed just two years later after a serious accident.

The line was constructed in two phases: 1920-1924 and 1932-1939.

In constructing the line, 30,000 helicopter flight hours were used.