The locomotive that is today known as Cass Scenic Railroad No. 4 is a 70-ton three-truck model built in 1922 with works number 3189 for the Birch Valley Lumber Co. at Tioga, West Virginia. Its empty weight is actually 141,250 pounds and with three cylinders of 12 by 15 inches and a gear ratio of 2.25, it produces a starting tractive effort of 30,375 pounds. In its revenue service, it came to two other operators until 1962.

The first was the Mower Lumber Co. of Cass, that bought it in 1943. From 1960 it was owned by Midwest Raleigh Inc. of Charleston, later known as Midwest Steel Corporation. There it was used to salvage the remains from the logging railroad. On June 7, 1962 it came into possession of the State of West Virginia that brought it to the Cass Scenic Railroad where it still today. So it spent all of its revenue and heritage in West Virginia.