I have collected some files which I am now going to show You.

My father-in-law was a train driver. He had also the license to drive a steam locomotive.
In Finland a locomotive driver had to participate to a course for filing art. In order to pass this course one had to make a workpiece which was a proof of the skills learned. Obviously my father-in-law successfully passed that course.
In the video, in addition of the many files, I will also show some of the workpieces he made during that course.
These workpieces are made by using a metal file only. Some drilling and cutting with a band saw was allowed but all precision work had to be done with metal files only. The result is quite unbelievable.

The video is spoken in Finnish but it has good quality hand written subtitles in English, German and Swedish.

The video is here