They sabotaged the trains?

A couple of days ago, trains in Germany were in complete chaos. Business as usual? Well, no: as it turns out, it was deliberate act of sabotage. Who did it, how did they do it, and what were they trying to achieve? Here's what we know so far.
Try this video:
• One reason your train ...
Chapters:
00:00 Questions
01:01 What happened?
01:31 How did it happen?
02:06 Sabotage: how do we know?
03:01 How many saboteurs?
03:51 Who did it?
05:19 Why not a cyber attack?
05:44 Why did they do it?
Music:
"Style Funk" and "Hot Swing"
by Kevin MacLeod incompetech.com/
Creative Commons Attribution licence
Data for map of Berlin by
OpenStreetMap openstreetmap.org/
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