This link gives detailed sketches of many of the rocks at torrelodones. There are lots of bolted routes but some are very short (one bolt then anchors). walk down the trails (many trails, all go to the same place more or less, we got a bit confused.) that start at the cercanias train station. there is a gate on the other side of the tracks that is sometimes closed but not locked. bring trad gear. none of the routes are more than 20 meters.