Only between gtl to klu (in ghats) and makalidurga curves are more rest of the route is straight with less curves and few years back route was trials were made at 125 kmph so after doubling they might increase mps to 130 kmph but at present all trains are restricted to 110 kmph between sbc to klu, 110 kmph between klu to gy and 100 kmph between klu to gtl. In fact GTL SBC line is having less steep gradients and curves compared to GTL RU line