The following instructions will probably seem very cryptic if you are new to Google Earth. If I could explain it better I would... If you can understand what I am guiding you to do, you will experience an "in the world experience". You will get the sensation that you are sitting on top of a moving monorail.
Zoom in on the monorail track (personally I like a long straight length of track similar to the section between Epcot and the toll booths for the Magic Kingdom. Move the image so that you center the monorail track in the middle of your screen and the the track is is perpendicular to your screen / line of sight. Lower your elevation and using the tilt feature, tilt the image DOWN so that you can see out the "front window" of the monorail... "Grab" the image near the top of your screen and pull in towards you, pulling the mouse on the same path as the track. The image on the screen will continue to glide forward...
Play with it, you'll get the hang of it!