I'm really sorry that I've made last suggestion with out the correct tag.
Here I repost the suggestion with some photos:

• Change Your train height Judging standard, or passenger will stuck in the platform!!
  

• Enable player load Different Model with Different Collisions when they use the Custom flexible track system, especially some rails attach with the bridge, tunnel or subgrade

• create new type vehicle which needn't power and could only spawn when creative if it's hard to realize the electrical railroad in short time.
  hope reply soon!

-----------------And here is the farther function if its possible -----------------------

• Try to make rail bridge or other flexible or lineable attachments partly if its enable, especially the catenary, the nightly solution is make a Electrical handcar enable player climb on and move the camera to hung the catenary on catenary support
• ATO system? control the train by distance?