Cleaning a grain boxcar

The Soo Line used what it called Mobile Cleaning Units — trucks with a power sweeper, power washers, and other cleaning and repair equipment — to clean and prep boxcars for grain shipment at its yards in Schiller Park (Chicago) and Shoreham (Minneapolis) in the early 1960s. The rig, with two workers, could clean a boxcar in 12 minutes. The truck is visible through the door of the boxcar in this view.
Soo Line photo