Peter,
Shared overlaps, are they equivalent to phantom overlaps? I was going through one of discussion in this forum and found the topic on Phantom Overlaps and the reply given by you, where overlap sharing is also discussed:
http://www.irseexam.co.uk/showthread.php...om+overlap
It says "We are not allowed to "share overlaps" but we can "share overlap track circuit" by defining a POL in the middle. The aspects of the two opposing direction routes up to the signals prove the entire 360m clear; however even if both trains then SPAD by 180m then they won't actually hit each other and it is just as safe (arguably more so as automatic reversion of a valid aspect if the other train SPADs) as if separate TCs provided."
Regards,
Saraswathi Penneru
Shared overlaps, are they equivalent to phantom overlaps? I was going through one of discussion in this forum and found the topic on Phantom Overlaps and the reply given by you, where overlap sharing is also discussed:
http://www.irseexam.co.uk/showthread.php...om+overlap
It says "We are not allowed to "share overlaps" but we can "share overlap track circuit" by defining a POL in the middle. The aspects of the two opposing direction routes up to the signals prove the entire 360m clear; however even if both trains then SPAD by 180m then they won't actually hit each other and it is just as safe (arguably more so as automatic reversion of a valid aspect if the other train SPADs) as if separate TCs provided."
Regards,
Saraswathi Penneru