The 2-10-2 or "Santa Fe" type had a short career on the New York Central System. In 1919 the American Locomotive Company delivered to the Boston & Albany ten class Z-1 locomotives in the USRA light 2-10-2 design. They were the first B&A locomotives to be equipped with a stoker. Weighing 352,000 pounds, they developed 69,600 pounds of tractive force. Their cylinder dimensions were 27x32 inches, their driver diameter 57 inches, and their boiler pressure 200 p.s.i. With 76 square feet of grate area, they had 4660 square feet of evaporative heating surface and their superheating surface totaled 1085 square feet.
In 1926, with delivery of the class A-1a "super-power" Berkshires, the 2-10-2s were deemed redundant on the B&A and they were reassigned to the CCC&StL. Whether they actually saw service in the Midwest is uncertain, for they were soon sold to the Canadian National as its class T-3-a. No. 1104 became CNR 4204; a 1956 photo of sister locomotive CNR 4202 in a scrap line, by Jim Parker on George Elwood's site, reveals that the class had been rebuilt with Elesco feedwater heaters, all-weather vestibule cabs, and other modifications for Canadian service. Information about the above photo showing No. 1104 in service on the B&A is not available.