track-clearer

from The Century Dictionary.

• noun A bar or guard suspended above the track just in front of the wheels of a locomotive or a horse-car, for the purpose of pushing any obstruction from the track; also, a cow-catcher, or a track-sweeper for removing snow from a railway.
• noun A triangular board at the outer end of the cutter-bar of a mowing-machine or harvester, serving at once to guide the grain to the cutter and to clear a path for the next course of the machine.