I came across this video on the Railways of Germany Forum. It is about 52 minutes long, but fascinating. The precision work, and the way that the work/employment is spread around the countries - Poland, Germany and Austria - is very interesting.

Yes it is all in German. But it is so professionally done, so clear, that the images speak for themselves. When they are putting the car on the bogies, the narrator mentions "Luftfeder" - this is air springs or an air cushion on which the cars ride. It would be the equivalent of the 5th wheel on a semi.

I am currently watching it for the second time! Enjoy!