In 1955 , 2 - 8 - 2 # 639 was shopped with a 22RA tender on which the stoker was inoperable .
The railroad switched tenders to keep the # 639 running .
In 1955 , 2 - 8 - 2 # 639 was shopped with a 22RA tender on which the stoker was inoperable , and the railroad switched tenders to keep the # 639 running .