XPost: comp.os.linux.misc   
   From: bowman@montana.com   
      
   On Mon, 8 Dec 2025 01:58:46 -0500, Paul wrote:   
      
      
   > It takes a while to absorb what is going on there, and what component   
   > makes rail "safe". Hint: It's not the hardware. You have to read   
   > articles like this more than once,   
   > to fully appreciate it.   
      
   That does seem to be convoluted. The parking brakes on a truck are spring   
   brakes that are applied when there is no pressure. The service brakes are   
   normally released and require air pressure to apply. A mile of cars each   
   with their own air supply and the signal supply complicate things.   
      
   Then there are the mechanical handbrakes. I don't know when, if ever they   
   get used. Maybe when they're humping cars?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)