Dang, those are some rare boxcars I've never seen, especially the MNX2339 Pepper Packing Co! The placard says something about the CB&Q for home road, maybe?
I've seen a lot of different high-voltage electrical equipment used by power utilities. This is a new one for me. It can't be something too heavy, because of the reservoir mounted on the bottom of the unit (identical to the top reservoir). Bulky, but not too heavy. There is a large electrical cabinet attached to it, so there is a control component. I'm thinking maybe a synchronous compensator, but it looks like none I've seen before. A synchronous compensator corrects power factor variations in the line so the reactive component of the power doesn't get too strong relative to the straight power component, either capactive or inductive. I know of one in Lévis, Québec, that corrects capactive power factors on Hydro-Québec's grid with and inductor that is basically a big electric motor the size of a large bus. Or it could be a smaller medium or low power transformer. They do look somewhat time-worn, weathered, so I'd figure they're old and either going for a major overhaul or refurbishment or to scrap after a replacement with newer equipment.
I am fascinated by this car. In would love to know more. The only "Aloha Shake" I know about, was a company in Aloha, Washington. Near the end of an obscure branch line, long ago abandoned by Burlington Northern. This was an area in that State very well known for timber products. Shakes were among those items.
