Besides the shopping center, Principe Pio is still a Cercanias station combined with a Metro station one level below.  Only long distance trains don´t go through there anymore.

Our knowledge has surpassed our wisdom. -Charu Saxena.

Well, uh. I first wrote about connecting commuter lines in the rapid transit section, then mentioned it again in the 'not entirely new idea' part on RER, and tried to paint the RER's express subway quality as the speciality. On the other hand, indeed Madrid is not a city of ten million with half a dozen termini, so main station connections don't make a network alone. Again on the other hand, even though all Paris RER lines go underground at terminal stations, lines A, C and (in the future) E do so only at one end, and connect back to old commuter lines well beyond terminals.

_{*Lunatic*, n.
One whose delusions are out of fashion.}