greetings -can anyone direct me to a website that contains a schedule for the metro. i am particulary interested in transport from Chamartin to Puerta del sol.many thanks

It's from 6:00 am until 2:00 am. There's only a timetable for the last hours, when they pass not so often. http://www.metromadrid.es/default.asp?id=233

Chuck --

If you are traveling during the day, metro trains pass through every three minutes or so. The trip from Chamartin to Sol will take you about 20-30 minutes depending on passenger traffic.

Take line 10 (dark blue) direction Puerta del Sur. In Plaza de Castilla (the next stop) change to line 1 (light blue) direction Congosto.
Get off at Sol.

Have fun!