I've always loved the unique way that European passenger cars and engines look. I love the wide variety of different looking engines. I want to get a crocodile engine one of these days.
I also really like how the steam locos have the red trim on the driving wheels. Gives them a unique look that is distinctly Europeeing.
I did recently purchase a really cool boxed seventies HO Roco trainset. The trainset has the DB engine and 3 passenger coaches in the top layer of the Styrofoam. There are 4 small freight cars in the lower layer of Styrofoam that are typical European cars, they are small and have 2 wheel trucks on the front and back of the cars. The box and owner's manual are all in German. Appears to be a set sold new in Germany that somehow ended up here. I was happy, paid 25 for the set complete in the box.
I also like how a lot of the European modern high speed trains look, just look so sleek and nifty.