When snowfall is light, the flanger is put to work. The flangers have two steel blades that are lowered between the rails. One blade throws snow to one side of the track, while the other blade does just the opposite. The springs have been removed from the trucks to prevent the spreader from moving up and down while the blades are lowered. If the flanger did have the springs, the blades could drop deep enough to damage the track structure or derail the flanger. The SP flangers are not bi-directinal, so they need to be turned either on a wye or turntable.
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