Robert Leffingwell loaned this image of Baltimore & Ohio Mikado No. 315 which he took shortly after the B&O renumbered its remaining steam locomotives to make room for new diesel power. No. 315, formerly 4515, belonged to class Q-3, erected by Baldwin Locomotive Works in 1918 following the USRA light 2-8-2 design (refer to the previous comments for No. 4500). Their grate area was 67 square feet, and their evaporative heating surface totaled 3775 square feet together with 880 square feet of superheating surface. No. 315 (4515) is shown here taking on water during what may have been a Chicago area railfan event, judging by the crowd in the background.