The bottom portion of the park can offer periodic shade, depending on the course of the sun. Barriers stand in place to block visitors from the railroad. The bridge begins its path to elevation at the beginning of the barrier.
You can even include links to a YouTube or Vimeo of a digital walk-through like this one: https://youtu.be/ncaVQ2V6XXU
Adaptive Reuse
Architects often find creative ways to reuse old structures that are no longer in use. Check out how old rail lines were adapted to create New York's High Line and Chicago's 606.