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On my layout, I plan to have a continuous loop mainline with staging hidden under the layout. Most of my layout will consist of two large (3x14) industrial switching areas, and one branchline (4x11). I want to be able to start a mainline train that will continuously loop the layout while I'm switching, however, I have two crossover points that will need to be protected from oncoming mainline traffic. If, for some reason, I have a derailment or some other problem and the switcher traffic can't clear the main in time, I'd like to devise some sort of 'fail safe' where the mainline traffic will automatically slow to a stop at a red signal just before the industrial area, and then when the crossing is clear, it will automatically slowly speed back up to the desired speed and continue on the loop. I know there are block signalling devices out there that automatically detect traffic and set the signal to the correct aspect, but I'm really interested in an 'autopilot' approach to mainline traffic while i'm switching. I will also like to have hands on control of the mainline when I need it. Does anybody know how I could do this?
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