guard-brushn. (on an electric railway) a metallic brush by means of which the current is conveyed to the motor.
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society > travel > rail travel > rolling stock > [noun] > locomotive > parts of electric railway traction unit
guard-brush1888
nose suspension1894
nose1907
pantograph1907
dead man's handle1908
1888 Science 21 Dec. 302/1 The current is conveyed from the guard-brushes and the wheels to the motor, and through the other rail to the ground [on an electric railway].