Tenders for Up-Gradation Of Obsolete And Defective Gsm Chipset To 4G Gsm Chipset In Remmlot System Fitted In 39 Bndx Based Hhp Locomotives And Comprehensive Annual Maintenance Contract Of M/S. Medha Make Remmlot System Fitted In Bndx Based Hhp Locomotives As Per Rdso Spec No.Mp.0.0402.04 Rev. 05.