Annual Maintenance Contract For Carrying Out, Checking, Maintenance And Repair Of Caterpillar Make Two Engines Model C 9 &Amp C18 Mounted On Track Machine High Output Dynamic And Stabilizing Machine (Dte) &Amp Shoulder Cleaning Machine (Frm) Working In N.E. Railway With Supply Of Spare Parts For Maintenance And Repair Of Caterpillar Make Engines And Deputation Of Competent Service Engineer By The Firm As And When Called Upon To Do So By The Railway.