This is a derailment in either 1954 or 1955.
According to KCS in the Deramus Era (Marre & Sommers) there were only 2 derailments that could have caused the damage to the loco as shown in the last photo of this set which involved a GP7.Locomotive
If the loco was KCS 155 the date is Sept. or Oct. 1955 when it was sent back to EMD for rebuild.
GP7 KCS 162 was wrecked in Sept or Oct 1954