This is a tram train painted in the colours of Berlin's more successful soccer team (we have two professional teams). I say more successful, but that's pretty relative as they sucked last season and were relegated to the second league, which caused some emotional blueness.
In Berlin blue is the colour of the U-Bahn, the underground train network, while green is the colour of the S-Bahn, the above ground train network. To make things more interesting on some lines the U-Bahn runs above ground and the S-Bahn runs underground. But anyway, our topic is blue, so here we have ( two U-Bahn entrances. )
It's not hard to find people dressed in blue on the streets, but this lady wore blue from her earrings down. And she was nice enough to let me take a picture of her.