If B&O Mikado No. 4201 survived till the 1956-57 renumbering of steam locomotives we have not been able to locate that information. No. 4201 was one of 70 class Q-1b 2-8-2s erected in 1911-12 by Baldwin Locomotive Works. They weighed 282,200 pounds and developed 54,587 pounds of tractive force. With cylinder dimensions of 26x32 inches, they had 64-inch drivers and sustained 190 p.s.i. of boiler pressure. Their grate area totaled 70 square feet, and they had 3926 square feet of evaporative heating surface and 811 square feet of superheating surface. No. 4201 appears here at Chicago, but there is no information about the date or responsible photographer. Edward Lorence provided the image from his collection.