The GX-1 680 Turbine Engine for The GX-2 class locomotives has been upgraded form 6,800HP to 6,900HP and max speeds incresed to 95mhp it has all the same spacts as the 650 but with a little more power. The GX-1 is a class of small turbine used, the GX class 1 Turbine drive is standerd build for DPR locomotives.