To illustrate the transformation of the I-6 (P-16) class over the years, above we see Chicago & Alton No. 658 (later 5298) in her Alco builder's photo from 1913. As built, this class incorporated some typical features of locomotives the E. H. Harriman railroad empire, of which the C&A was part at the time, including the large highly arched cab and the extended smokebox. These features were later modified and the high headlight was lowered. I found this photo, and that of Chicago & Alton 2-8-2 No. 864, in an antique shop several years ago. Two later views of Alton No. 658/5298 appear on this Alton Steam page.