Hall Tunnel burns, un-dated photo but after the abandonment of the C&S in Mar 1939 and more likely in the 1960's or '70's given the shape of the truck. I have done a limited search of Colorado Newspapers but turned up nothing under Fire(s), Hall Tunnel Fire, Hall Tunnel Burns etc. Maybe someone else will have better luck.
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digital.denverlibrary.org]
There is a second image similar to the above [
digital.denverlibrary.org]
The Hall Tunnel buildings from another angle, seen in better days...
[
digital.denverlibrary.org]