ATSF 2-10-2 1705 is helping ATSF EMC E1 number 2 with train 17, The Super Chief, west of Trinidad Colorado on February 22nd 1939. Otto Conrad Perry photo, from my collection.
ATSF 3940 is seen in mid-train helper service, near Pine Lodge California, on April 26th 1933, during The Great Depression. Otto Conrad Perry photo, from my collection.