Experiments for replacing the kanthal resistors of type 4R tramways (Czechoslovakia), with silicon low-alloyed cast iron, are made. The casting parameters, cast iron composition, resistor geometry, are taken in to consideration. A cast iron with the following chemical composition has been experimented: C = 2,14-2,48 percent; Si = 3,92-4,48 percent; Mn = 0,28-0,50 percent; P = 0,038-0,050 percent; S = 0,032-0,040 percent.
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机译：进行了用硅低合金铸铁代替4R型电车（捷克斯洛伐克）的kanthal电阻的实验。考虑了铸造参数，铸铁成分，电阻器几何形状。实验了以下化学成分的铸铁：C = 2,14-2,48％; Si = 3.92-4.8％; Mn = 0.28-0.50％; P = 0.038-0.050％; S = 0.032-0.040％。
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