I know the old system was fickle but the saying "don't fix someting that isn't broke" isn't an old wives tale, it has very good foundation, just ask BA about it.
Surely it would have been better to just take one train out of service and fit the new heasdsets to it and make sure they work first instead of ripping them off all thre trains long before the replacements have left the factory, these no-name Chinese manufacturers are notoriously unreliable with their target times.
Surely it would have been better to just take one train out of service and fit the new heasdsets to it and make sure they work first instead of ripping them off all thre trains long before the replacements have left the factory, these no-name Chinese manufacturers are notoriously unreliable with their target times.