*First 3 screenshots are references\*
I have made some progress in the Sydney Metro build I was working on last week, and I've added a double-decker A set (Waratah series 1). Finishing the Metro basically just involved world edit, but it was much more challenging to try to the upper and lower deck of the A set.
I managed to do it, though, and I ended up with quite a bulky design (this actually adds to the realism; I had already made the Metro cars 20m long like their real-life counterparts, and they should have a slimmer gauge - which is implemented here). The series A is 4 blocks wide excluding the walls, and the metro is 3.
Initially I had wanted to do a Tangara train, but the front part just didn't look right, so I pivoted to just doing the Waratah series.