Hey Dieselpunks! Caption this!

I found this great shot while browsing through some pages containing photographs of the Bundesarchiv. I.e. the central register of photographic images (mostly historical) of the Federal Republic of Germany.

Now I have a little challenge for you:

Caption this!

But beware! “Obvious” captions are not permitted. If I get more than 10 captions, i.e. comments on this post, there will be a price draw. So, go on captioning!