From: denismfmcmahon@gmail.com   
      
   On Tue, 17 Feb 2015 01:56:17 -0800, rcp27g wrote:   
      
   > It is not "quite labor intensive".  I've visited signalling control   
   > centres where these crossings are operated from.  They form a very   
   > small part of the task that the signallers doing other railway control   
   > tasks have to deal with.   
      
   That's probably because most crossings are AHB.   
      
   Take for example the West Coastway line in the UK between Southbourne and   
   Chichester. 6 AHB crossings in 5 miles. Converting those to full barrier   
   crossings with remote monitoring would probably increase the road closure   
   times from around 12 minutes / hour to more than 36 minutes / hour at   
   each crossing, and significantly increase the workload of the signaller   
   who will have to manually initiate and then visually check up to 36   
   crossing activations (6 crossings, 3 tph in each direction) per hour.   
      
   At 10 seconds per crossing, that's an extra 6 minutes workload per hour.   
   Personally I think 10 seconds is very optimistic for activate crossing,   
   wait for barriers to drop, check cctv, clear approach signal. 30 seconds   
   is probably more reasonable, and that's 18 minutes per hour.   
      
   You might think that the signaller can attend to something else between eg   
   activating the crossing and checking the CCTV, but that sort of   
   multitasking is what leads to signallers making errors.   
      
   --   
   Denis McMahon, denismfmcmahon@gmail.com   
      
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