Northern Pacific diesel control center panel at St. Paul, Minnesota, on August 21, 1969. Peg board showing locations of diesel locomotives on Tacoma Division. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment

Northern Pacific diesel control center panel at St. Paul, Minnesota, on August 21, 1969. Peg board showing locations of diesel locomotives on east end of railroad. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment

Northern Pacific diesel control center panel at St. Paul, Minnesota, on August 21, 1969. Peg board showing locations of diesel locomotives on Tacoma Division. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment

Northern Pacific diesel control center at St. Paul, Minnesota, on August 21, 1969. Dispatch office with peg board showing locomotive locations, employee Bill Walters. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment, railroad employee

Northern Pacific diesel control center at St. Paul, Minnesota, on August 21, 1969. Dispatch office with peg board showing locomotive locations, employees Bill Walters and Dick Noble, one unidentified. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment, railroad employee

Northern Pacific diesel control center at St. Paul, Minnesota, on August 21, 1969. Dispatch office with peg board showing locomotive locations, employees Bill Walters and Dick Noble. Photo by J.M. Fredrickson. Other Subject Classes: dispatching equipment, railroad employee