Carl Weber provided this view of No. 3639, of the B&M's class P-2, which an unnamed photographer captured at Boston on June 16, 1954. After the P-2s had been in service for a number of years the B&M applied feedwater heaters, either the Elesco bundle-type (as shown on Nos. 3622, 3659 and 3665) or the Worthington type 3BL as shown here and for No. 3673. For dimensions of the class, see the commentaries for Nos. 3622 and 3665.