The good, the bad, and the ugly before a trip from Madrid to Zaragoza in the Alta Velocidad Española AVE train.
The good, the little rectangle that represents the window. It’s so easy to know if your seat number belongs to the one next to the window or the one next to the aisle.
The bad, the sign is in reverse order. You’re in the aisle while you’re reading the sign, so the closer number should be the one belonging to the aisle (e.g. 16B)
The ugly, you’ve to guess which button turns your light on. There’s no indication whatsoever. They could have put the buttons on the left and right of the light bulbs making it crystal clear, but I suppose they didn’t because of cost restrictions on the electric circuitry.