What a great photograph, Todd!
I believe this is the wreck that occurred on July 8, 1914, just outside of Denver, between the eastbound Fish Train (no, 73), returning to Denver with an early Monday morning arrival from Grant, and the westbound morning Morrison train (no. 60).
This was a head on collision, with the Fish Train in violation of the Morrison train's time. The locomotive on the Fish Train was number 70, while number 12 was on the Morrison job.
The wreck is discussed in the Klingers'
C&S Platte Canon Memories . . . , page 10.
Here is another view of the carnage, also from the Klingers' book:
A lot of weekend fishermen are going to be late getting back to Denver and their jobs . . .
Jim Courtney
Poulsbo, WA