When he arrived, he gave instructions for the platform staff to hold the next train even if the signal turned green, and then he and the Stationmaster entered the tunnel to look for the fault.
[1] When he returned to the station he stood by the tunnel headwall with a red hand lamp and held every train for one minute after the signal turned green as a precautionary measure.
After several trains had passed he went in search of a second wire with the intention of temporarily connecting the faulty signal's circuit to an unused pair of contacts on the same relay, to restore normal operation.
In the inquiry, the signal engineer was held wholly to blame, because although his temporary fix was reasonable under the circumstances, the instructions that he gave to the platform staff were incorrect.
The holding of the train for one minute after the green aspect was reasonable, but the driver should have been instructed to, "... proceed at caution and be prepared to stop short of any obstruction".