From: bds@macbook-air-4.local   
      
   On 2020-11-13, Luigi Fortunati  wrote:   
   > The bridge and the train have the same length at rest.   
   >   
   > The bridge collapses only if the entire weight of the train rests on   
   > it.   
   [...]   
      
   > [Moderator's note: This is essentially the same puzzle as the ladder   
   > paradox, which even has its own Wikipedia entry.  In fact, it is closer   
   > to the "man falling into grate" version originally discussed by the   
   > late, great Wolfgang Rindler. -P.H.]   
      
   The version we got in class (way back when) was the train entering the   
   barn with the doors opening/closing just in time.  The answer, of   
   course, is relativity of simultaneity.   
      
   --   
   ciao, Bruce   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)