ATSF 2-10-2 1696 is assisting EMC E1 number 3 with train 17, the Super Chief, on rugged Raton Pass near Wootton in 1938. Otto Perry photo, from my collection.
Either a freight train being helped over a steep grade or a long passenger or freight train requiring more engines. This album is for the Helpers and the double heading trains of the old days both steam and diesel.
