Technical Up-Gradation Of Existing High Performance Tamping Express Machine 09-3X-3967 To Latest Available High Output Dte I.E. Tamping And Stabilizing Machine (Model 09-3X Dynamic & Stabilizing Machine) Working Over N. W. Railway & Technical Up-Gradation Of Existing Tamping Machine 09-32-Csm 979 To Latest Available Latest 09-32 Csm Dynamic Machine Working Over N. W. Railway.