Dennis461 asked for a sketch. Here a rudimentary one, not sure if this helps or not, but here is what I’m thinking.View attachment 113518
You mean there's that many tank cars in America?? Woe betide anyone waiting at a grade crossing. Hope they took food and water, and a razor too.Scissor Y's save space. They are very rare on the prototype, as diamonds, even the railroad kind, are expensive.
I thought I knew of one here, but it turns out that rather than build a diamond, they re-aligned the track.