Drivers repeatedly reported problems seeing the signal properly. But management did nothing, despite a string of near misses caused by the poor visibility of the signal. There are 14 platforms at Paddington station. As soon as you come out of the station the lines go into six. Signal 109 is at the end of a long curve and there is a mass of gantries and wires blocking your view.
Signals usually come in a box with four lights - green, yellow and red.
Signal 109 is unique. It is very confusing. That is why so many drivers complained about it. Rail chiefs were told time and time again to reposition the signal, but they refused. The news of the crash must have been broadcast on the TV just minutes earlier.