A two-car Blue Line train comes in from Wood Street and heads out under the Allegheny to North Side; a Silver Line car departs for Wood Street. You can see the video at full resolution on its Wikimedia Commons hosting page.

The video is obviously hand-held. There are some very sophisticated video-stabilizing algorithms in our video-editing software, but the parade of identical square windows in a moving trolley makes them panic and jiggle the picture all over the screen, so we give you the video without stabilization.