On Thursday, October 9, 2014 12:49:15 PM UTC-4, John Levine wrote:   
      
   > I expect it's the same ballast that they installed in 1910, with the   
   > rails and ties replaced as needed.  Have any of the tunnels been   
   > closed for more than a few overnight hours since they were opened?  I   
   > don't think so.   
      
   I think the ballast was lowered in the 1930s to install the overhead   
   catenary.  From pictures it seems like a very tight fit, even though the   
   tunnels were supposedly designed to allow future installation of catenary.   
      
   FWIW, the tunnel and station signal heads are the same as installed in 1910.    
   I would suspect that the innards have been replaced.   
      
   Our Penna Sta tourguide told us that if a train passes a double red, it is a   
   major screw up and messes up many train movements.   
      
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