RAIB have published a Safety Digest today on the above incident - see the Digest here - in summary:
The primary cause is described as:At around 04:12 hrs, during the hours of darkness, two track workers were standing on the westbound track at Eccles station, adjacent to Platform 2, when an empty passenger train approached them from the direction of Manchester. The track workers had been working under the protection of a line blockage that had been taken by the Controller of Site Safety (COSS), who was responsible for ensuring that the track workers were protected from train movements. The track workers had been standing on the track to paint a white line along the edge of Platform 2. They had just been told to stop work and were preparing to leave the track when the train approached. The train involved, reporting number 5C31, was operated by Avanti West Coast Ltd. It consisted of a Class 390 electric multiple unit which was travelling from Longsight depot, in Manchester, to Lancaster. On approaching Eccles and seeing the track workers’ reflective clothing, the train driver sounded the train’s horn and applied the emergency brake. The track workers heard the warning horn and quickly climbed onto the platform. They were clear of the track approximately four seconds before the train passed them while travelling at 69 mph (111 km/h). The train came to a stop and the driver reported the near miss to the signaller. After seeing the train pass and come to a stop, the COSS also called the signaller to notify him of the incident. The signaller instructed the COSS to stop work and sent Network Rail response staff to the station to investigate.
The incident occurred because the COSS had given up the line blockage before informing the track workers that they had to move clear of the line and making sure that they had done so.