The device's field trials are being carried out since 2000-01 and site acceptance tests and modifications are being done since November, 2006 in the 1,736 km-long Katihar-Guwahati-Ledo/Dibrugarh section of Northeast Frontier Railway at a cost of Rs 158.67 crore.
"But despite the long trial, a reliable anti-collision device (ACD) is yet to be developed so far. The ACD was not in a position to judge whether the inputs derived from the signalling systems were dependable," the report pointed out.
It also noted out that there was no system to detect whether the ACD installed in locomotives and guard vans were defective or not.
Similarly, the CAG has found despite commissioning of the train protection warning system (TPWS) in Southern Railway as a measure to prevent accident in May 2009 at a cost of Rs 49.49 crore, the trial reports indicated various failures of the equipment requiring modifications in the software.
"The performance efficiency recorded during trials was between 77 and 90 per cent as against the acceptable level of 99.9 per cent...The TPWS work commenced in 2005 in North Central Railway had not yet been completed despite incurrence of expenditure of Rs 41.54 crore," the report said. MORE
