When the axle counters cannot continue to communicate with each other they shutdown halting the network. As they are located on the skyrail sections it is not possible to now drive up and fix the issue. You need to now get total occupancy of the track due to the lack of clearances on the structure.
This takes hours and also each counter had to be manually reset and a test train sent down the track followed by another shortly thereafter to reset and confirm all working.
It is possible by manufacturer design to reset the counters remotely but this as never implemented.
The sell on the axle counter solution was 1 in 1 million fault tolerances which of course was bull. MTM screws us again.
Peak hour chaos on regional train network as trains delayed for hours