The Commissioner (Safety) of Railways is conducting the inquiry, whether the derailment was man-made or due to technical snag, or due to poor maintenance of railway track, Southern Railways General Manager Rakesh Mishra told reporters here.
One person was killed and over 30 injured in the mishap.
Ruling out handing over the Heritage Nilgiri Mountain Rail train service--running between Mettupalayam and here, to private operators, he said the sector was actually running under loss.
To a question on setting up a museum on NMR, the official said a proposal has been sent to the Railway Board to establish it either in Udhagamandalam or Fernhill.