Locomotive brake resistor

The utility model discloses a locomotive brake resistor. The resistor comprises resistor discs and a string rod, the string rod is provided with a plurality of insulation sleeves in a stringing mannerfor electric insulation between two adjacent resistor discs, and compared with the prior art, after the resistor discs are heated during working, the resistor discs can be thermally extended and deformed towards the length direction of the resistor discs due to the fact that the two end parts of the resistor discs are respectively provided with long-strip-shaped holes through which bulges of thestring rod and the insulation sleeves penetrate; the insulation sleeve can move on the string rod along the axial direction of the string rod. And the moving distance is smaller than the length of thebulge, so that when the thickness of the resistor disc is increased due to heating expansion, the resistor disc can slightly move the insulating sleeve along the axial direction of the string rod, the insulating sleeve is prev