Left: Ford Motor Company snow plow equipment ca. 1925 in front of the District Building. Photo from the Library of Congress. Right: DDOT snow plows in front of RFK stadium, November 5, 2010. Photo from the DDOTDC Flickr pool.
The image below, also from the DDOTDC flickr pool, shows a Caterpillar Loader used in snow removal efforts from February 9, 2010: