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I need assistance choosing what occupancy detectors, servo switch motors and related systems to use, Q1. should i gap both rails, per block = 4 sets of double gaps, per section in the ''stop, slow stop' long track sections, so much conflicting info online, my head is a mess, it would really suit me to gap both rails, and not just one side...i laid 100 plus metres of track n designed the layout in winter over two years, totally stuck now, even after running trains big long trains... Q2. if i do gap both sides of the track do the current sensors go on the incoming positive + side wire or the return negative (dare i mention 'common') to me 'common' is so divisive i know only refer to 'common' it as something that i can walk and play and relax in, in London. q3. Location detection - whether a train is located at a specific point on the layout. Proximity detection - whether a train is located at or near a point on the layout. which work best, ??? i mean which is easy peasy to install, run, maintain and dont need the brains of the 'team who priced the childrens hospital,' esp to send proper commands to turnout motors via the accessory bus, which systems actually suffer from proximity to main power bus? i know light effects light sensors, but does current effect the hardware attached to the light sensors as most hardware needs to be in close proximity, this is so confusing, LDR, PT and IR pairs, hall sensors, proximity sensors, Rfid if you had a choice which one to go for???? which to totally avoid. personally I think rice size rfid are fab, but they are reported not to work well if 12 inches near a bus wire..