From: jishnu@nospam.verizon.net   
      
   On 12/28/2015 12:32 PM, Stephen Sprunk wrote:   
   > On 27-Dec-15 20:24, hancock4@bbs.cpcn.com wrote:   
   >> Stephen Sprunk wrote:   
   >>> Note that trains with only 4-aspect PRR cab signals will receive   
   >>> Cab Speed 80mph as Approach Medium (45mph) and Clear 125mph as   
   >>> Clear (MAS), and will not receive Cab Speed 60mph and Clear 100mph   
   >>> at all.  They also can't distinguish between Restricting (20mph)   
   >>> and Stop.   
   >>   
   >> The impression I got was that in _addition_ to display the signal   
   >> aspect, the cab signal system now also displays the permissable   
   >> speed.  That could be either as a light ring around the speedometer   
   >> or a digital readout.   
   >   
   > The human interface is orthogonal to whether they're equipped for the   
   > 4-aspect or 9-aspect systems.   
      
   The human interface changed because of ACSES, which required   
   installation of new PDUs which display both the signal speed and the   
   civil speed and the speed limit that is currently in effect.   
      
   I agree that the number of aspects in the underlying cab signaling   
   system is an orthogonal matter.   
      
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