This is Embankment. Change here for the Circle, District and Northern lines.

This is a Bakerloo line train to Elephant & Castle. The next station is Waterloo.
This is a Bakerloo line train to Harrow & Wealdstone. The next station is Charing Cross.

Embankment is close to lots of interesting locations, like the world famous Savoy Hotel. The closest you'll get to anything involving waveforms is the occasional ripple on the Thames, though, which (as the name "Embankment" implies) is close nearby.