When our Israel tour was in Haifa, our guide mentioned that Haifa was the only city
in Israel that had a subway - and that one of the stations was right around the corner
from our hotel. Cool.
The Carmelit is actually an underground funicular or inclined plane railway.
Much of Haifa is built on the top and sides of Mount Carmel, and this train
provides service to six stations from the top of the mountain down to Paris
Square in downtown Haifa. The entire system consists of two two-car trains
that counterbalance themselves on a pair of drive cables. The system
has a single track with a short passing track midway along the route. It originally
opened in 1956 and underwent significant renovations in the late 1980s. At the
time I visited it was apparently lightly used and ran an operating deficit.