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The overpass

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On the overpass C the head A of the train AB encounters the head N of 
the train MN traveling in the opposite direction:
-------------M------->N------------------------
----------------------C---------------------->x
----------------------A<-------B---------------

Since the two trains have the same length and speed, in the land 
reference also the tail B of the train AB encounters the queue M of the 
train MN on the same overpass C:
----------------------M------->N---------------
----------------------C---------------------->x
-------------A<-------B------------------------

At that point, from the tail of both trains a bomb destroys the flyover 
but the trains are now gone and so they are safe.

Instead, in reference to both trains, the passage of trains on the 
overpass is no longer simultaneous and the train that passes first 
destroys the overpass while the other one has not yet passed.

So a train perishes.

In the AB train reference, the MN train is contracted and therefore the 
M tail passes on the overpass (and destroys it) while the tail B of the 
train AB has not yet passed.

In the AB reference you save the MN train (which passes first) and 
destroy the AB train:
----------------------M--->N-------------------
----------------------C---------------------->x
-----------------A<-------B--------------------

In the MN reference you save the AB train (which passes first) and 
destroy the MN train:
-----------------M------->N-------------------
----------------------C---------------------->x
-----------------A<---B--------------------

Which of these scenarios is the right one?

-- 
Luigi Fortunati

Credere e' piu' facile che pensare
Believing is easier than thinking

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The overpass LuigiFortunati <fortunati.luigi@gmail.com> - 2017-08-13 09:51 +0200
  Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-13 15:53 +0200
    Re: The overpass Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-13 19:13 +0200
      Re: The overpass The Starmaker <starmaker@ix.netcom.com> - 2017-08-13 11:02 -0700
  Re: The overpass Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-13 09:06 -0500
    Re: The overpass Luigi Fortunati <fortunati.luigi@gmail.com> - 2017-08-13 19:07 +0200
    Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-13 19:40 +0200
      Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-13 21:32 +0200
        Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-13 21:45 +0200
          Re: The overpass Prudence Oppenheimer <phow@innfldo.sp> - 2017-08-13 21:32 +0000
            Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-14 00:34 +0200
      Re: The overpass Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-13 23:03 -0500
        Re: The overpass Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2017-08-14 15:52 +0200
          Re: The overpass Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-14 15:21 -0500
            Re: The overpass Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-14 16:43 -0500
    Re: The overpass "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2017-08-13 17:14 -0700
      Re: The overpass Tom Roberts <tjroberts137@sbcglobal.net> - 2017-08-13 23:04 -0500
        Re: The overpass "Ross A. Finlayson" <ross.finlayson@gmail.com> - 2017-08-14 19:55 -0700

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