Bill Daniels writes:
With a light weight of 240400 lbs (120.2 tons) and a nominalApparently, it was common practice in later years to operate them in pairs.
But on the basis of personal sightings, as well as photos I have or have
seen, I can say with assurance that they were often run individually. For
sure, a string of these things (and the Santa Fe did bring them west out of
Amarillo several cars at a time) would have required an engineeer with a
deft hand on the brake valve.
Richard H. Hendrickson
Ashland, Oregon 97520