>> but it is also a lot more complicated than just having brakes At least one train maker still struggles getting this bit right. http://en.wikipedia.org/wiki/

>> but it is also a lot more complicated than just having brakes At least one train maker still struggles getting this bit right. http://en.wikipedia.org/wiki/Siemens_%28train%29#Braking_issues http://en.wikipedia.org/wiki/Siemens_%28train%29#Braking_iss... I'd be very worried about safety with something this complex unless it could be proven to always fail in a safe way.