Germany (CNN) – I thought that building trains would be a greasy, oily, noisy business. But as Marketplace Europe discovered on a trip to Germany, building trains is tidy - the messy bit is figuring out how to get them travelling easily across Europe's borders.

When we arrived at Siemens Rail systems factory, just outside Dusseldorf - the home of 2,000 workers - it was like we had landed inside a giant train-set. It was neat, shiny and bright.

Building trains in the 21st century is pretty much mess-free. Apart from welding and painting, it is all about assembling component parts, rather like wiring a highly complex computer - albeit one that will move at 300km per hour.
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