Thanks krish, especially for your welcome, The Reason for 56823 being an DEMU rakes may be the line block in TPJ-TJ section. For Few Days MV-TEN-MV service is sort terminated till TPJ, so the rake cannot go to MV, so they are sending an DEMU instead.
I like IRI for its simplicity of Information and large volume of data in a single place, organised to large extend. In fact i get most of the details in IRI only. I would like to see the data here still more perfect.