Studebaker’s Automobile Plant (center) and Wilson & Bros (lower left), circa 1936 (fair use).
Note the two tunnels behind the steam plant in this 1930s image from MNHS.org.
1952 Explosion. Taken from Eastern Elevator (now Richardson) looking over the ruined copula of Saskatchewan Pool 4B. Noticed the scorched face of 4A, which appears to still be smoking when this was taken!