Achim,
Speaking of "Lockomotive" (Railroad Engines), i take it you have been to to the "Hamburg Minature Wonderland" located in the Hamburg harbor district. It does not have much like the art you saw (your photos above), however it is a great place to visit. I was there twice now, first in 2009 at that time they started building the Minature Airport, my second visit was in 2011 when the airport was completed. A must place to visit when one is near Hamburg, Germany.
For anyone that like to see a video of the place just Google ---> hamburg miniature wonderland
Then scroll down to the "official video"
Last year I took this photo on a Pagoda outing (locomotives were build here in London, Ontario in the past). No art of any kind mind you, still a nice locomotive
Dieter