In the probe report, seen by Reuters, the Commission of Railway Safety (CRS) investigators said the first collision occurred due to modifications done to the signalling circuit to fix frequent problems at a nearby rail-road barrier.
Local railway staff did not have a standard circuit diagram which led to a faulty connection in the signalling system when they tried to take the boom-barrier circuit offline for repair, it said, adding that the malfunctioning system directed the passenger train onto the path of the freight train.
Reuters last month reported for the first time that investigators were focusing on the repair work on the rail-road barrier and its possible connection to a manual bypass of the signalling system.
Source: CNA
