This is another view under Market St., showing
the Muni level of the two-tiered subway. It's a rare city in the U.S.
that supports both a light rail and a heavy rail system underground.
And much rarer still, the services are operated by
different transit agencies.
Present planning will add a third underground level crossing Market
St. A new "Central Subway" will provide a route from the
present Caltrain terminal area, and will cross deep under Market St. between
the Muni Metro Powell and Montgomery stations. It will then
head to the north, near Union Square and to a terminal under