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Passengers travelling with @SouthernRailUK will have endured some delays on the #Seaford branch this morning, on top of some disruption last week. This comes a week after we completed resignalling on the line + people have rightly asked us why. 1/
@SouthernRailUK The issue this morning was down to a power surge last night with the external supply, which caused some of our train detection circuits to fail. These tell us where trains are and always fail to “red” as a fail safe. We worked round the problem but there were delays. 2/ 
@SouthernRailUK So why does a new system not work perfectly “out of the box? When a new system is installed with many thousands of components and miles of wiring, however much testing we do, there’s a chance something will let us down in the first few days. 3/
