There is also a minor difference between the in room showers in the Superliner 1 & 2 cars.

The older (1) version has a vinyl curtain covering the shower/toilet area, while the newer (2) version has a sliding door. When I am in the former, I use the community shower, as I have found the curtain to be ineffective in keeping water out of the sitting area of the room.

I appreciate that some might consider this to be be a superfluous post, since there is no way that a pax will know which version he is booked into, until he actually boards.