A Fly-Over (termed "Tour" in Google Earth) is a natural "addon" after spending the time to accurately design and plot out a particular Trip. It can be viewed by others in Google Earth but of course is far more accessible as a Video within an App.
The result of rendering a Tour as a Video has been vastly improved in Google Earth Pro by virtue of MS Movie Maker being embedded as a tool, thus avoiding the use of "screen recorders" with their various shortcomings, so that is the method we now use.
These Fly-Overs are recorded so as to speed up the train to about 10 times the speed of the train journey (including stops). For example the 40 minute train journey in Section 4 (3 stops between) takes about 4 minutes.