| Here are pages four and five of a 16-page booklet entitled "Pennsylvania Railroad System: Altoona Works." It was issued in conjunction with a "Visit of the American Society of Mechanical Engineers: October 5-7, 1925." Page four compares two passenger locomotives: a Class D-1 from 1881 and a Class K-4S from 1925. Page five compares two freight locomotives: a Class H-1 from 1881 and a Class I-1S from 1925. |