The 1813.544km-long Haoji railway, with a designed top speed of 350 km/h and an annual capacity of 200 million tons, is a new national strategic corridor for transporting the coal resource north to south. It features high locomotive traction power and heavy return current at the traction substation, with a maximum traction current reaching 2300A. Silver-copper alloy contact wire with better conductivity is used for the OCS, which assures more superior traction capability of the locomotive.