Freight Schedules
EL Through Freight Train Classifications Times and Connections 4-30-1967
EL Through Freight Train Classifications Times and Connections 4-28-1968
EL Through Freight Train Classifications Times and Connections 10-26-1969
EL Through Freight Train Classifications Times and Connections 10-28-1973
Other Resources
Graytrainpix has a 1966 freight train schedule, condensed schedules from 1964 and 1971, and a great symbol history including traffic handled by each train.
George Elwood’s Fallen Flags has a Daily Operations page which contains customer lists and other good operational information.