The Norfolk & Western's first class of Mountain types were the K-1 group erected for passenger service by the railroad's Roanoke shops in 1916 and 1917. No. 111, shown above at an unknown date in a photo by R. J. Foster, belonged to the 1917 group. The location may be Cincinnati. These 4-8-2s had 70-inch drivers and a boiler pressure of 200 p.s.i. Their 29x28-inch cylinder dimensions were unusual in having the piston diameter larger than the stroke, a condition known as "over-square"; this was an effort to reduce piston speed at a given road speed, and was said to create difficulties in starting these locomotives. Weighing 314,340 pounds, the K-1s developed 57,188 pounds of tractive effort. Their evaporative heating surface totaled 3857 square feet, with 882 square feet of superheater surface, and their grate area totaled 80 square feet.