Ahead of the Rail Budget, the Railways is being asked to explain how it continued levying a surcharge that should have stopped March 31, 2007.Under the scanner is the move by the Railways to convert a safety surcharge on passenger fares into a development charge to raise money for its dedicated freight corridor project. This move, which drew adverse remarks from the Parliamentary Standing Committee on Railways in two successive reports, has even invited queries from the Prime Minister’s Office.At the centre of the row is a Rs 1,000-crore sum which the Railways will end up collecting as development charge from passengers by the end of the current fiscal. Not a fresh levy, this development charge was essentially a change of name for the safety surcharge which the Ministry had levied since 2001 to raise funds for the Special Railway Safety Fund (SRSF).Set up in October 2001 following recommendations of the Railway Safety Review Committee headed by Justice H R Khanna, the SRSF was a non-lapsable fund of Rs 17,000 crore to clear arrears in replacement and renewal of overaged safety related assets like tracks, bridges, signal and telecom equipment and rolling stock within a fixed time frame of six years — from 2001-02 to 2006-07.