Well, Red51 surely has two gauges (standard & minecart types). What I want to note are a few more things.....
1) Tram or rail decorations of placing decorative attachments to 'fill in' by adding grass, concrete, or whatever else. Europe has a ton of scenic and decorative tram tracks to make note of
2) Track variety (view below tweet) - Drawbridge rails.
Casually skimming through Twitter finding Japanese folks talking about how one train can go one way while another can pass through with the opposite being like a drawbridge. When we get trains I hope they're weighted and awesome. I'm also getting influenced by my hosts who are allowing me to stay with them so I see various new trains types I haven't seen before.
When in doubt Red51 & friends can look at Traincraft for Minecraft to see how to properly do trains, theme each cart to resources, and having to build them up frame-by-frame (piece by piece) until it is fueled up and running.