Opened in 1991, Monterrey's subway has 2 lines, 31 km, and
32 stations. Line 1 is completely elevated, while Line 2 is partially in subway, with
5 km of elevated track
and 5 stations. Four lines with a total of 80 track km are planned by
the year 2008. I mean 2010. I mean, uhm,...
In 2013 the new Mexican president expressed his commitment to mass transit, mentioning Line 3. Just a month later, the government announed it's commitment to build the nine station, 7.5 km line Ground was broken in October 2013, Except for a short interchange with Line 2, the new line will be elevated.
When riding the Monterrey metro, you may wonder, "who farted?" You'd be surprised to learn that it was the train, which runs on methane.
from Allen Morrison's
American Electric Traction Links
Design-Construction of Precast Segmental Elevated Metro Line for
Monterrey, Nuevo Leon, Mexico
safety project from The Hive
Honourable mention: Forty
km away in
funicular railway runs up a
mountain and then into a series of caves.