Walter A. Peters of Springfield captured this view of 4-6-2 No. 5266 ringing her bell at East St. Louis. The photo predates September 1938, when the Alton retired her. No. 5266 was the only member of the P-11 class, originally the Chicago & Alton's class I-2 No. 601. She had 80-inch drivers and 22x28-inch cylinders, and the 200-pound boiler pressure common to virtually all the Alton's Pacific type locomotives. No. 5266 weighed in at a mere 100 tons, and her slim boiler and high drivers gave her a rakish look. When erected by Baldwin Locomotive Works in 1903 she apparently lacked a superheater, but was later fitted with 850 square feet of superheating surface, reducing her normal evaporative heating surface from 3435 to 3100 square feet. Superheating the steam keeps it from condensing to water vapor while being used in the cylinders. Because steam compresses but water does not, excessive water vapor can blow out the cylinder heads. The photo is courtesy of Gary Thompson.