The optimal wheel/rail adhesion of heavy-duty locomotives under traction must be determined given that suboptimal wheel/rail adhesion may result in low creep utilization. skidding. and idling. Here. https://www.roneverhart.com/Medline-ReNewal-Reprocessed-Arthrex-Scorpion-Needle-AR-13995N-MULTIFIRE-SCORPION-NDL-BLACK-AR13995NR/