From: ahk@chinet.com   
      
   Denis McMahon  wrote:   
   >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.   
      
   Thank you for offering a bit of logic.   
      
   --- SoupGate/W32 v1.03   
    * Origin: LiveWire BBS -=*=- UseNet FTN Gateway (1:2320/1)