From: fortunati.luigi@gmail.com   
      
   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.   
      
   In the reference of the train (traveling at relativistic speed) the   
   bridge (contract) is shorter and the weight of the train never rests   
   entirely on the bridge: the passengers are safe.   
      
   Instead, in the reference of the ground, the train is shorter and there   
   is a time interval in which the weight of the train rests entirely on   
   the bridge which, therefore, collapses: for the observer on the ground   
   the passengers of the train are doomed.   
      
   Who's right? Are train passengers saved or not?   
      
   [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.]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)