See quotation. The powerful ploughs used on the railroads in winter are constructed on the same principle as of old.
1792. When a deep snow has obstructed the roads, they are in some places opened by an instrument called a snow plough. It is made of planks, in a triangular form, with two side boards to turn the snow out on either hand.—Jeremy Belknap, ‘New Hampshire,’ iii. 78–9.
